Mechanical or electrical - Team Camaro Tech
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post #1 of 17 (permalink) Old Dec 17th, 09, 07:57 PM Thread Starter
 
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Mechanical or electrical

I will be replacing the underdash mount water temp gauge and the Oil pressure gauge with in dash units when I replace the original gauge panel in my 69'.

the Oil pressure gauge has a plastic tube with oil in it that goes thru the firewall to the engine block. Am I correct in assuming this is an "mechanical" gauge???


The water temp gauge has a wire that is covered by a metal coil wich also runs to a sensor on the engine block. Is this mechanical or electrical gauge???

Any help is appreciated!

Novice but learning!!!
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post #2 of 17 (permalink) Old Dec 17th, 09, 08:18 PM
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Jim
 
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Re: mechanical or electrical

Both of your gauges are mechanical. The temp gauge uses what is called a capilary tube, which runs from the gauge to where the sender screws into the block. It's not a wire, and if it is cut or kinked the gauge is junk.





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post #3 of 17 (permalink) Old Dec 17th, 09, 08:56 PM
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Re: mechanical or electrical

Throw the plastic crap away and pick up copper capilaary, and a couple ferrels for the ends

So the modern replacement oil gauges come with plastic now?

My Spelling is not incorrect...it is creative

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post #4 of 17 (permalink) Old Dec 18th, 09, 08:48 AM
 
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Re: mechanical or electrical

Yes the modern mechanical guages come with nylon tubing now. If you are replacing the gauges I would either install electric ones from Autometer or if you prefer the mechanical gauges get a braided line kit for the oil pressure gauge(also available from Autometer). Theres no much worse than pressurized engine oil leaking into the interior of you car!
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post #5 of 17 (permalink) Old Dec 18th, 09, 11:34 AM
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Re: mechanical or electrical

Quote:
Originally Posted by WJPE View Post
......if you prefer the mechanical gauges get a braided line kit for the oil pressure gauge(also available from Autometer). Theres not much worse than pressurized engine oil leaking into the interior of you car!
That is what I did for my AutoMeter oil pressure gauge..

David F.

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post #6 of 17 (permalink) Old Dec 18th, 09, 01:01 PM
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Re: mechanical or electrical

Quote:
Originally Posted by Steptoe View Post
Throw the plastic crap away and pick up copper capilaary, and a couple ferrels for the ends

So the modern replacement oil gauges come with plastic now?
The nylon tubing is very flexible and given it's small diameter and relative wall thickness, it's very strong and capable of extremely high pressures. (Ever read the burst strength printed on this stuff?)
The OE oil pressure gauge used nylon, and my only suggestion is to step up the diamater to 3/16" for a more responsive/faster reading.

A copper line would be a very difficult install, would kink more easily, and work harden and crack over time. Copper is way-old school, long before better materials for the application like nylon became available.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #7 of 17 (permalink) Old Dec 18th, 09, 03:01 PM
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Re: mechanical or electrical

Quote:
A copper line would be a very difficult install, would kink more easily,
Thats just poor instaltion practice
Quote:
and work harden and crack over time.
Thats why one puts a coil in the length and doesnt move...hell I have old vintage cars with orginal copper good as the day it was made over 50yrs ago
Quote:
Copper is way-old school, long before better materials for the application like nylon became available.
yeah and over a few yrs this stuff hardens cracks, ferrels slip off...
Yep might be fine for modern disposable short life cars...and it looks like crap.

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post #8 of 17 (permalink) Old Dec 18th, 09, 05:43 PM
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Re: mechanical or electrical

Mechanical gauges are typically less expensive that mechanical gauges. You might have some spare holes in your firewall connector if you wanted to wire up an electrical a gauge.

Dave
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post #9 of 17 (permalink) Old Dec 18th, 09, 10:28 PM
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Re: mechanical or electrical

Quote:
Originally Posted by Steptoe View Post
yeah and over a few yrs this stuff hardens cracks, ferrels slip off....
Hardens? Cracks?? Ferrels slip off???
You should shop elsewhere!
Not sure what you're buying, but I've got used, 20 year old nylon tubing that I can still reuse and I can't get the damn ferrels (olives) off!

The nylon stuff is just so much easier and it does the job.. Are you aware of the route that the oil line takes from the block to the console gauge? -especially on a big block. Doing that in rigid copper with coils under the dash and into the gauge pod.. Are you serious?
Copper would be an expensive, tedious pain in the butt to install and for what gain?
GM and all the others are right to use it..

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #10 of 17 (permalink) Old Dec 19th, 09, 12:03 PM
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Re: Mechanical or electrical

Quote:
Are you aware of the route that the oil line takes from the block to the console gauge? -especially on a big block. Doing that in rigid copper with coils under the dash and into the gauge pod.. Are you serious?
I have done it 3 times in the last 30 yrs ( rebuild the body/inteor of the car about every 7 to 10 yrs) on a sb once with the heater vent ducting in and once with it out... factory routing...yep it rates up there with the top 5 awkward jobs

My Spelling is not incorrect...it is creative

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post #11 of 17 (permalink) Old Dec 20th, 09, 05:34 AM
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Re: Mechanical or electrical

Most new homes don't use copper they use Pecx (sp).
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post #12 of 17 (permalink) Old Dec 20th, 09, 12:39 PM
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Re: Mechanical or electrical

Wires never leak and they're made of copper

Dave
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post #13 of 17 (permalink) Old Jan 2nd, 10, 08:10 AM
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Re: Mechanical or electrical

(I read these posts this morning and just wanted to leave my 2 cents on this subject)

I am installing my NYLON line as of last night and finish it this morning (got a late start), I ordered the replacement from Classic Industries and that is what I was sent (nylon) ... So far, I do not see a problem with the material ... The routing was through the underneath backside of the console, under the heater box and through the factory hole in the firewall above the gas pedal (oh, speaking of that, I broke the factory rubber grommet any replacement suggestions where I may find one), and then under the wiper motor and to the back of the engine block to the oil pressure sensor and I was/am glad it was nylon and not copper, as it flexed easily as necessary for the installation (hmm) ... Now I think personally, it will work just fine as the connectors are a 3 part system, the nut, the brass ferrel, and another brass (very small) plug in to the end and inside the nylon tubing which helps the nut and the ferrel crimp down ... Okay having said all of that ... I am replacing an old nylon tube (previous owner), which was very difficult to remove from the oil pressure gauge as it SEALED very tightly (hmmm) ... BUT, there was a coupler in the OLD line that DID leak (hmmmm again) ... Now I AM a Contractor by trade and I would NEVER use Flex nylon tubing in any one of my projects for water (Copper baby copper) Oh, but I live in California where we do not see a whole lot of freezing of the pipes (I understand the Flex tubing doesn't burst with the freezing expansion) ... However, I am probably sure the factory was copper, but I worked with what I had to work with as of the parts that were sent to me and IF they had sent me copper, I would have used copper (and I would have feared the kinking to the point of cracking during the install) ... I do remember having two thoughts during the install
1) I hope this tube doesn't curly up and kink as I am feeding it through the firewall (it didn't, it was very easy to work with),
2) When I put my NEW carpet in (the old coupler had a drip on my rubber carpet mat), "I hope this doesn't leak"
Anyways, reading the above posts AFTER I had already done my install, I am only commenting to everyone's posts, statements, and my findings ... (Oh, last thought, I hope that nylon line doesn't leak)

Kevin (kmg1969ss)
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post #14 of 17 (permalink) Old Jan 2nd, 10, 12:45 PM
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Steve
 
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Re: Mechanical or electrical

Factory wasn't copper, it was nylon. If it leaks, it was fitted wrong! Fitted correctly, they don't leak.
Also, the factory hole/dimple for the oil pressure line was high up on the firewall, behind the distributor.
See RPO-U17 Item 3.
Classic sell the "correct" grommet for $12 # HC456.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #15 of 17 (permalink) Old Jan 2nd, 10, 11:41 PM
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Re: Mechanical or electrical

Yeah, I saw that hole / grommet today while working on the car .. I thought to myself, I says self ... "I hope that isn't the hole for the oil pressure gauge as it would be a little more difficult getting to" ... I did remove old nylon tubing from the oil pressure gauge ...
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