The SST-90 is a bit earlier. They came out in 65 to my knowledge and were popular for a few years. The transistorized Super Tachs dominated after that in regards to Sun tachs. That said, I can imagine someone transferring the greenline to another car if it was just a couple years old. I can appreciate a well executed theme but at the end of the day you should build what you want. Swapping tachs is a pretty small deal if you change your mind. Especially if you figure out a way to mount the transmitter without drilling any new holes.
Jason
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