So I decided today was the day I would figure out why my tach didn't work. I purchased the car like this, so had no idea what was going on back there. There is an older looking stewart warner gauge, when I pulled the tach out the dash it wasn't even hooked to anything, go figure. But looking at the back of the tach I have no clue as to what goes where. I know there has to be ground, power, illumination and distributor connections. No labels anyone have any ideas?

 

Unless you've got a thing for vintage SW tachs (and that's not a bad thing), you might come out ahead financially by selling this one on ebay and buying a newer one that doesn't use a sender.

 

That's what I wanted to hear. Going to just get a sunpro. Thanks for the input guys.