I just don't know the reason...
"$33. Tachometer":http://store.summitracing.com/partdetail.asp?part=SUM%2DG2870&view=1&N=700+150+4294815748+400304+4294891600+
Red and orange go to power, black to ground, white to the headlight switch
Green goes to the negative terminal on the coil or the tach terminal on the distributor
Something tells me that even if I had 12v worth of batteries in a box this wouldn't work. Can any one tell me why?