I'm looking at a 10,000 RPM SST that looks exactly like the one I used to have on my '55 Chevy & '67 Chevelle back in the day, but the one I'm considering says 6 cyl 12 volt, and there is no separate transmitter with it, although I believe this early tach should go with a transmitter. I just happen to have a Sun Super Tach (9,000 RPM) with separate transmitter which specifies 12 volt 8 cylinder. I'm wondering if the tach I am considering would work with the transformer I already have. Anyone have experience with these early Sun Super Tachs?