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Re: 91-94 instrument cluster retrofit into 88-90?
1991 has the same connector on the back as 1988-1990 but the harness is pinned out slightly different.
To put a 1991 instrument panel in a 1988-1990 you need to:
Move A10 to A9, move A11 to A10, Move B15 to B11, then run a wire from the white tach lead wire at the ignition coil into the instrument panel connector terminal B15. 1991 was the first year the harness has a tachometer wire to the instrument panel.
1992-1994 have a separate DRAC module that would have to be wired in. The connector for the instrument panel is different.
Here is a recent thread on the swap;
http://67-72chevytrucks.com/vboard/s...d.php?t=764890
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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