Dumb factory tach question.

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Dumb factory tach question.

Post by Roadcaptain S3 on Sat May 14, 2016 8:39 am

I just picked up factory gauges with tach. Not sure if/when I'll install yet.






I currently have the base sweep gauges. What do I have to do hook up the tach?
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Re: Dumb factory tach question.

Post by Oldschool454 on Sat May 14, 2016 8:52 am

There's a thread that talks about this whole process and what's involved in rewiring your dash harness. I did this in my car as well. The thread has pictures of how the wiring needs to be. "SWITCHING FROM SWEEP TO ROUND GAUGE CLUSTER RE-WIRE".
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Re: Dumb factory tach question.

Post by Oldschool454 on Sat May 14, 2016 9:01 am

...and just cross your fingers that the tach actually works lol
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Re: Dumb factory tach question.

Post by Roadcaptain S3 on Sat May 14, 2016 9:08 am

I've got this one, and a later one with the "fuel economy" gauge in place of the tach. So if anything ain't working I can probably swap 'em out.

But this one is in pretty good shape and the owner said it was in storage wrapped in plastic for twenty years.

We'll see...
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Re: Dumb factory tach question.

Post by Hawk03 on Sat May 14, 2016 10:33 am

I did this too and it wasn't too terribly difficult. You will need to run a signal wire from the tach to the correct pin in the cluster plug. You could probably run the signal wire directly to the post on the back of the tach too.

http://www.g3gm.com/t57-switching-from-sweep-to-round-gauge-cluster-re-wire


Last edited by Hawk03 on Sat May 14, 2016 12:25 pm; edited 1 time in total (Reason for editing : thoughts)
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Re: Dumb factory tach question.

Post by Roadcaptain S3 on Sat May 14, 2016 12:22 pm

Gracias!
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