OER Tic Toc Tach for 68, 3 studs on back? - Team Camaro Tech
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post #1 of 2 (permalink) Old May 9th, 08, 10:15 PM Thread Starter
Join Date: Mar 2006
Location: Canby, OR
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OER Tic Toc Tach for 68, 3 studs on back?

I am installing an OER tach into my non-tach 68 Camaro. I have a repro printed circuit for the cluster and factory service manual and a reprint of the wiring diagram for the tach and gauge setup. I have searched for the answer but can't seem to find anything that matches, maybe the info I am finding is for 69.
There are three studs on the back of the tach.
Looking at the side with the circuit board,
One is on top and connects to a blue wire inside the tach, and the circuit on the board goes to the spot on the connector that went only to the temp light.
One is at about the 8 oclock position, connects to an orange wire inside, and on the circuit board ties into the strip that also touches all the warning lights.
The third is at about the 4 oclock position and does not touch the circuit board.
There is also a wire inside that connects to the metal mounting plate and to the gauge housing, I am presuming this is the ground.
Can anyone tell me which wire goes to each of the other three?
Thank in advance.
I also have a factory set of gauges for the console with its wiring harness to maintain all the other function of the stock instrument cluster

Last edited by napabilly; May 9th, 08 at 10:17 PM. Reason: more info
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post #2 of 2 (permalink) Old May 10th, 08, 06:07 AM
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Join Date: Dec 1999
Location: Yorkville, Illinois USA
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Re: OER Tic Toc Tach for 68, 3 studs on back?

Here's a pic og my modified non tach 68 PCB.

The top tach stud is the signal wire, it does not touch the pcb, and is wires separately to the coil negative.

The bottom left and bottom right are power. I don't recall which is which, but if you look closely at the tach assembly itself, you can tell.
One is "ignition on power" for the tach, it's the one who's lil wire attaches to the lil pcb in the oer gauge.
The other one is "constant battery" power for the clock. If you look at the gauge closely, it's the one that goes straight into the clock motor, NOT into the tach pcb. This is a new connection, "battery power" is not part of the non gauge harness, it's probably the one that goes where the temp light connection used to be.

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