'73-76 had an ammeter, 77 up had a voltmeter.
'73-'79 had a mechanical oil pressure gauge, 80 up was electric.
Just these few changes will mean your old wire harness won't work. But you can figure out what wires to rearrange in the dash plug and make it work. I've done it, but I had both the old and the new harnesses in front of me.
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Just as if I knew what I was doin'
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