Used on 184hp 193hp 163hp engines M57D30/306D1 into E36 chassis. Simplified wiring EDC15 includes: Ecu plug Gas pedal plug Obd2 plug X20 (round plug) Out for reverse light Out for starter activation Out for OBD2 ground (earth ring) Out +12v to fuel pump Inside round plug: RPM Oil pressure lamp Alternator lamp ECU switched +12v Fuel pump relay Reverse light Starter activation Comes at 2m total lenght Note: Use with a deimobilised ECU, this wiring is for the body side. Note2: Wirings may have differences from the photo shown but same placement.