Factory Tach not working - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 24th, 14, 10:13 PM Thread Starter
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David
 
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Factory Tach not working

My Factory Tach stopped working after I had an older MSD 6AL box installed. Since I have a 4 speed tranny, I really want my tach to work. Where do I start? I checked the wiring and it looks like it has been cut. I heard that I need an adapter in order to get the tach working. Where can I find this adapter? I have a first gen RS/SS, 396, 4 speed.
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post #2 of 5 (permalink) Old Oct 24th, 14, 11:57 PM
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Brian
 
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Re: Factory Tach not working

David - Your signature block is blank so what year?

The tachometer feed wire is a single brown wire through the bulkhead connector so you can splice or replace that easy but the real question will be once you hook it up will your factory tachometer be happy?

More than likely no, but if you have a legacy tachometer port on the MSD box maybe or will you need to buy or create a tachometer filter in order to make your factory tachometer work.

Our sticky to DIY a filter https://www.camaros.net/forums/showthread.php?t=309026

Take a look at MSD's website for filters for your box, or search for threads here in this forum. There was a thread last week on GM HEI swaps and purchasing a tachometer filter to stop bounce.


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post #3 of 5 (permalink) Old Oct 25th, 14, 10:57 AM Thread Starter
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David
 
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Re: Factory Tach not working

Thanks, 69 Pace for the response/info. That's a '67 1st gen. I discovered the brn tach wire disconnected from the distributor while I was tracking down my ammeter issue. Thought I better not hook it up until I was sure it would not damage the tach. I'll check the MSD box for the legacy port and definitely study the sticky on DYI filter. Pretty sure you're right about needing a filter.

Guess I need to figure how to fill in my signature block,
Thanks.
Dave
Just looked at the sticky. Wow, that's so simple! I'm on my way to Radio Shack, now. Thanks again.

Last edited by moses david; Oct 25th, 14 at 11:12 AM.
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post #4 of 5 (permalink) Old Oct 25th, 14, 11:14 AM
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Re: Factory Tach not working

A short testing will not cause long term damage IMHO.

You will notice very quickly if it has fits, or sticks or bounces all over the place which are all symptoms HEI ignition incompatibility, and use needing a filter for that particular tachometer. You can also have the original tachometer guts retrofitted to modern HEI standards.

Go to your control panel available in a few places such as clicking on your login name on the top right of the screen, then on your profile page click edit profile, Edit signature and save.

Or the left hand side of the index page, under site navigation click user CP.


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post #5 of 5 (permalink) Old Oct 25th, 14, 10:19 PM Thread Starter
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David
 
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Re: Factory Tach not working

Your advice has been very helpful, Brian. I did not get the filter put together, but I will post results once I do. I did find an unused port on my MSD box. It looks like a special plug would go into it. Not sure if that's a legacy port or not.
Where or who would retro fit my tach for HEI compatibility? I would like to fix it myself if I can. Always good to have alternatives, though. Like Clint says, "a man's got to know his limitations". Thanks, again for your help. This site has helped motivate me to fix so many little electrical issues on my Camaro, i.e. gas gauge stopped working, diagnosed problem; replaced fuel sending unit. In doing that repair, discovered tail lights weren't working. Found and fixed a fried wire from the tail light pigtail to the headlight switch. Repaired the wires that were cut from the bulkhead to the console wire harness for the ammeter. (it now works!) Pulled the instrument panel and replaced all the bulbs and grounded the panel. Oh, I can't forget the horns! I had no working horns. Per TC's advice, I soaked 'em and coaxed 'em (tapping) and that over several weeks, brought the OEM horns back to life! Thank You Team Camaro! You Rock.

'67 RS/SS 396 4spd Muncie 12 bolt diff.
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Last edited by moses david; Oct 25th, 14 at 10:39 PM.
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