Quote:
Originally Posted by ray_mcavoy
I agree!
Since your 74 is wired for a factory gauge cluster with an ammeter, only a 73 - 75 gauge cluster will be a direct plug-in swap.
A 76 or 77 gauge cluster (with a mechanical oil gauge & voltmeter) would be relatively easy to adapt ... you'd only have to change a couple wires to switch from an ammeter to the voltmeter. And in some cases a wire for the brake warning light.
More significant changes were made to the cluster plug pin-out when these clusters were changed over to electric oil pressure gauges.
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Would it be impossible though? The 81 - 87 clusters are readily available and reasonable in price.