i install aftermarked engine ecu to turbo cars etc. my problem is getting the stock revcounter, toyota nissan to work properbly. when using multy coils. the ecu has a output for the revcounter but must be used with a electronic ignition module to convert it to a negative trigger and a ignition coil to operate properly,witch is not practical. if i put a 18w globe in the place of the ignition coil it only works on low rpm....can anyone please help. i need a circuit diagram i can built to drive the revcounter.........