wallyo5-
I installed one of those tach's in mine. Works great, and the existing instrument lighting illuminates the tach perfectly. I opted for the 6,000RPM version rather than the 8,000. I picked up the 12V source by splicing into a wire in the instrument cluster, only powered when key is ON. then one ground wire (also on the back of the metal cluster case), and the third wire out to the coil. The biggest pain is R&R of the instrument cluster.
Neil