Thanks everyone. My fault, but I should have explained a little bit further. A dear friend of mine is doing a fantastic job on building a '63 Nova straight axle gasser. He loves the looks of the older Sun style tachs mounted on the steering column. He would like to have one as old as possible that still works without benefit of a sending unit. He doesn't know this, but I want to buy him one for his car because he has been such a great friend over the years. I know I will see a bunch of these at the swap meet Saturday. Quite honestly, I'm a little apprehensive about buying any used electronic item from someone I know nothing about or will ever see again. Guess if it's in nice shape and the price was right, I could always send it out for repair if need be. Jim, I will also check into that Sunpro.
My '62 came with a Sun tach and sending unit. (Not from the factory. Definitely owner installed). I guess it worked ok. I don't really recall because I only had the motor running a few times. Did a little research and as mentioned in one of the above threads, the sending unit took a unique battery which they don't make any more. Someone had used a similar, not identical, Duracell battery which wasn't recommended. I know I sent at least the sending unit, maybe the tach also, to what I believe was Williamson Electronics. They put all new circuitry in the sending unit. I don't think it works perfectly, but for the present time, it's close enough for me. Read about those batteries and got a kick out of it. It seems that when the batteries wore out, they weren't being disposed of properly. People were just throwing them away in the garbage. Many environmentalist didn't like this and GM then came out with a tach not requiring batteries. I don't know, how many cars had this style tach back in '61 and '62?? I'm guessing not many to where it really mattered. Besides, how much easier does it get then to hook up a tach directly to the engine. Looks like there was concern about the environment way back then. Probably precursor to Al Gore's Global Warming, Carmine.