Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The entire gauge cluster will be need to be swapped, as the metal housing and printed circuit board are different between idiot lights and gauges. The sending units are different as well. Both of my '71's and '72 LeMans are factory gauge cars, I've had the blue '71 totally apart, the body on my body dolly, and out of concern over the over 40 year old dash harness, replaced it.
From pullng and selling gauge clusters over the years, there is a difference in the rally gauge dash harness and the idiot light dash harness. Memory serves right, one can swap two wires and make the standard harness into the rally gauge harness. Might want to see how pliable your wiring harness is. My HO GT-37 had been off the strip since '77, stored with original owners till I managed to buy it nearly a decade later. Even though the molded dash asm was soft, the dash harness had several wires that were dry, and a few wires had been spliced into. Buying a new harness just gave me some peace of mind, as have worked on several friends cars that had shorted wiring and one Chevelle that had a dash fire.