vertigto,
One thing I don't see you mention is the circuit board. The circuit board used for the idiot lights is different from the rally gauges. That will have to be changed for the rally gauges to work.
My '70 had the idiot lights when it was born. Somewhere along the way a hood tach, rally clock and rally gauges were added. The temp gauge didn't work when I bought it.
The short story is I had a new circuit board and rally gauges installed. The oil pressure was too much for the oil gauge in the new cluster. It was determined that having to change it wasn't worth it since the same thing would happen again. I know you don't want to hear this, but I went with the aftermarket gauges. The only item working on the rally cluster is the fuel gauge.
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