Non Factory Tach Dash Cluster to Factory Tach Dash Cluster (1969)

[Touch_Of_Madness]

I have a hunch someone has tried this before and has the answers. Least I hope thats the case. It appears that the dash wireing plug between the non tach/full gauges isnt the same as the wireing plug for the dash pod with the factory style tach/full guages (less vacuum).

The fuel gauge feed appears to be run through one of the instrument cluster lamp curcuits. The left turn signal works fine with the left switch but the right turn signal appears to indicate through the high beam indicator.

I turn the plug over and it pegs the fuel gauge and the brake indicator lamp comes on.

Anyone happen to have a cross over wireing diagram? The plug is numbered from 1 to 12 and it would be easy just to state an example like 1 should be 5 or 2 should be 3. But so far I seem to be stuck to go trial and error on my own unless someone has already done this swap.

Any help would be appreaceated.



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Thank you Byrd. I was wondering if the non gauage dash and the tach dash cluster had the same circuit. I do realize that the tach is seperate that wasnt my question, JimKshortstep4x4, but thanks.

My 69 came with a non gauge dash pod and I recently installed not only a RPO gauge dash pod but opted for the RPO tach as well. Its an attempt to clean up the dash a bit since one of the previous owners had installed an aftermarket tach (which didnt fit the dash all that well) and a tripple guage package (which looked like even more of an add on than the tach).

The non tach dash (with guages is the same as the tach dash which makes sense since they just added the tach). But I am curious if they are both the same as the non gauge type dash pod (this only had the speedo and fuel gauge in the dash pod) the rest was idiot lights.

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thank you 71swb4x4

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the effort is appreciated Rod thanks
better to have more than one person say it then sit here pulling my hair out ;-)

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Thanks again for the GMC pauls tip.
The gauges are working properly now. That tip is pure gold.
Now if only I could think as well as the gauges worked. . .

[byrd]

I have both here in front of me and both are the same, the printed circuit of each one tach and non tach follows the same pattern, and should interchange no problem. maybe you have something that has been reworked in your harness???

[JimKshortstep4x4]

The factory tach has a separate harness from the main harness. The difference between a tach dash and non tach dash is the printed circuit which is made to clear the back of the tach. The main harness plug is the same and you should not be able to reverse it as the tabs are different.

If you can reverse yours I would suspect that someone has worked on it.

Jim

[71swb4x4]

http://www.gmcpauls.com/Tech%20Tips1.htm
Here you go. It's the second or third tip.

[Rod]

You might try the tip here on wiring for full gauge http://gmcpauls.com/Tech%20Tips1.htm

ahh well slow on the trigger again

[Rod]

I've never tried that method. So I can't speak if it works or not.

[68speedalert]

Hopefully you didn't smoke your gauges already. GMC pauls tip does is correct; used it for numberoneson's '72. I suspect that someone did like you did with our gauge dash. I had to rework all the gauges, their resitors were burned out. I combined three gauges for the fuel and two for the temp gauge.