Temp sending unit - Team Camaro Tech
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post #1 of 3 (permalink) Old May 27th, 09, 06:46 PM Thread Starter
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Join Date: May 2007
Location: Fremont, CA
Posts: 58
Temp sending unit

So I just converted over to a Z28 gauge cluster so I don't have all of the idiot lights. Everything is working except the temp gauge. When I look at my wiring diagrams for my 71 camaro it show that the green wire attaches to the sending unit; However there are two wires in this harness; Green and Green with a white stripe. ? Where does the green with white stripe go? I was running after market gauges in the car for a few years, and I am sure I swapped the sending unit years ago, but really cannot remember. Does the 71 (350) need a sending unit with two wire hookups?
I have tried grounding the one with the stripe, tried connecting the two together? Do I have the wrong sending unit? Would like to figure this out as soon as possible. Any help... greatly appreciated. (71 RS Camaro) My book does not show anything on this other wire.....
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post #2 of 3 (permalink) Old May 27th, 09, 07:03 PM
Join Date: Sep 2008
Location: Michigan
Posts: 1
Re: Temp sending unit

Here is the information directly from the wiring harness of an existing instrument gauge assembly. This is compatible with the above listed years of Camaro's for an instrument gauge (U-14 package) swap out. There is no need to purchase a new and expensive wiring harness. You can use your existing harness and remove each pin to the below listed slots.

Editor Note: Fire up the wiring diagrams from the above link so you can see the pin-out for the standard plug and the pin-out for the U14 gauge plug. This will make a lot more sense.

If your looking at the black wiring harness, there are numbers from 1 - 6 on one side and 7 -12 on the other side. Each number represents a slot of the color coded wiring. The following is the color coding sequence which should be fitted into the numbered slots:

Slot # Color coded
#1 Dark Brown (Tach)
#2 Dark Green/White
#3 Pink (double wired)
#4 Light Brown
#5 Light Grey
#6 Black
#7 Light Brown/White
#8 Pink, connected to #3 (wired in loop)
#9 Light Blue
#10 Light Green
#11 Dark Blue
#12 Light Blue/White (Light Blue is thicker wire)

correctly wired plug for u14 gauge cluster

Note: /White indicates a white stripe on the color coded wire. The #3 slot (pink wire) will have two protruding pink wires, one which is wired into a loop with slot #8 and a second wire which is attached to it.

Slots #'s 1 thru #6 (Lt to Rt)on the top and slots #7 thru #12 (Rt to Lt) on the bottom. Note slot #3 depicting the pink looped wires from slot #3 to slot #8.

old Pin 4 (brown) must be released from the connector and left out
old Pin 2 (light brown) moves to Pin 4
old Pin 12 (dark green) moves to Pin 2
old Pin 3 (dark blue/white) moves to Pin 12
old Pin 1 (pink) moves to Pin 3
Tach goes into pin 1 (just run a wire from the distributor [TACH] plug on HEI. If you're careful you can re-use the harness pin from old Pin 4).


To swap the wires, you release the wire contact from the plug on the end of the wiring harness. You can release the pin by inserting a very small screwdriver or paper clip into the connector and depressing the locking tab. Once you release the tab, slip the wire contact out of the plug and bend the small locking tab back. Insert the wire contact into the designated position (listed above), it will click when it engages back into the connector).

The volt meter has its' own spade plug connection. You can just run a lead into the "IGN" terminal of the fuse box which supplies power only when the key is in the "on "position.

You must purchase and install a new temperature sending unit (FOR GAUGES) for the temperature gauge to work properly.


Last edited by ezcruisn71; May 27th, 09 at 07:28 PM.
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post #3 of 3 (permalink) Old May 27th, 09, 07:27 PM Thread Starter
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Join Date: May 2007
Location: Fremont, CA
Posts: 58
Re: Temp sending unit

Thanks. That is very valuable information. I wish I would have had that previously. My friend and I basically had to figure that out step by step using my old gauge harness (flat behind gauges) against the new gauge harness; Got everything to work. (well except temp gauge). I think I got all of the wiring conversion correct. Again, everything works except the temp gauge.
Note: I already have a sending unit that worked with an after market temp guage. The question I have is, in the engine compartment I have two wires that I believe go to the sending unit. Dark Green and Green with a white stripe. Any idea where the green with white stripe goes? Is the sending unit for this gauge package require a two pin hookup (against engine.) Appreciate it.
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