Wire color codes
From my experience these swaps are pretty easy with instructions, but without them will cause you some headaches. Does your car have gauges already and if so are you just changing to upgrade?
I have installed a couple of these kits and they usually come with a conversion diagram. Also the Autometer gauges also use there own sending units and not the factory ones. So make sure you have these also.
Here is low down on your wire colors. Someone else may have a diagram handy but this will help you for now.
On all GM's of that era the wire for the lights is grey
I believe you will have a couple pinks down there. one should be for your gauge key +12v this same pink is used for the volt gauge the other one is for the reverse lights if you have a floor shift automatic.
The temp is dark green
If I'm not mistaken the original oil pressure is mechanical so you wont have a wire unless it is for a dummy light then it would be dark blue.
The fuel gauge is light tan or brown.
Let me know if this helps.
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