i had an internal coil obd 2 dizzy converted to obd 1. but the wireing harness is made for the external coil. the car only runs when the external coil is pluged into the wiring harness. i think it is compleating the circuit. but the coil wire is not hooked up due to the internal coil on the dizzy. is there any way to fix this problem. i want to get rid of the external coil all together. and also my tachs do not work anymore. any ideas.