[PDC]

Looking at swapping the gauge cluster in my 73 Trans Am. It currently has functional 6k tach and 100 mph speedo which clearly is not correct for the 73 car. But every gauge in the cluster works: tach, speedo, temp and oil pressure.

I have done quite a bit of research and see that the contacts on the printed circuit boards ‘appear’ to be consistent for 1970, and then 1974-76 cars. The circuit board contact pattern for 1971, 72, and 73 cars is all the same - but it is different than the 70, 74-76.

My question is this - will the harmonica in the dash harness for a 73 Trans Am work with any 70-76 gauge cluster, or if I have (for example) a 74 gauge cluster, will I need an entirely different dash harness with different harmonica clip?

Because all of the gauges in this technically incorrect 100 mph 6k tach cluster work properly in my 73 car, I wonder if the dash harness clip will power up pretty much any 2nd gen cluster, or if the PO necessarily changed out the dash harness when swapping in this incorrect cluster.

Hope this question makes sense.

Thank you.