I have a '71 Challenger R/T 340 car with a transplanted 440. The tachometer is not wired to the coil. Under the dash I see three connections to the tach. One has a blue wire with a L shaped boot over it. The other appears to be black with a white stripe and the third is simply a bare bolt. Does this bare terminal simply connect to the negative terminal of the coil? If anyone has a pic of the back of a Ralleye Dash tach, that would be fantastic. Thanks