MY 1990. New crank sensor ordered but possibly also ignition amp is a goner. These are rare on these shores and it gets really expensive from MOSS motors etc. so I consider wiring in a standard item. But I cannot find an internal diagram for this module. MY1990 has as the only one pin 3 connected to the ECU, on the ECU side the pin is anmed "IGN MODE SELECT". Any idea what this signal does? Looks like it is an output from the ECU to the amp.

Anybody found a replacement and can post part number and pinout?