The Professor has changed so many expensive items he just about does have a new car - at least in the engine management systems.

Professor. When you say you have tested items for spec was this statically or did you actually change the items and run them in the car with the same results? e.g. throttle control switch, EHA or throttle micro-switch.

I tested according to Bosch/Mercedes specs for CIS. Some were with the engine off and some with engine on. The throttle control switch was tested offline with an ohmmeter to make sure that it made contact upon closing then it was tested connected and power one where I measured voltage as I hit the throttle hence opening the switch. It's consistent.