bosch1BOSCH 88 PIN ENGINE MANAGEMENT ECU – Fitted from about 1990 onwards this system has many advanced features such as sequential fuel injection and engine condition monitoring. Note: different sized pins at each end of connector.

bosch2BOSCH MOTRONIC ECU (35 & 55 pin) – Baseplate View – Note the 4 larger Torx head screws indicating this ECU has an internal ignition power stage. If the 2 right hand screws are missing (replaced with plastic plugs) the ECU has external ignition power stages (or modules) usually located on bulkhead near engine.