Have any of you ever played around with the old Sun tachometers? The one with the black control box? I picked up a 12v 6 cyl. Sun for my '54 chev, but I'm not sure how they work or how to adjust it. There's a battery on the inside of the box. What's that all about? Can you still get the battery?
I've converted the car to a 12v negative ground. What do you think about building some kind of a voltage drop, and eliminating the battery all together?
