I'm sure this is 'not' the way to do it but, 30 yrs when i got my 65 GTO it had the standard idiot light dash/wiring and console/wiring.
I bought a rallye dash to install.Back then info for these cars wasn't as easy to find as today with repro everything and the internet.
So what i did was cut the bulb sockets off for the oil,water temp,crimped connectors to the wires and after tracing the wires to see where they went,I added the correct sending units and the gauges have worked fine since. I did not add a rally dash harness as these cars were originally equipped.
I'm just saying that by using a test light or volt meter, the wiring diagram and it shouldn't be very hard to figure out which wire goes where. But beware, some of the wires in your new harness might not be the same as the factory used.
I have my dash out right now so maybe i can help with any more questions.
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