Bosch Pump inquires..

[zx_volcane]

look under where the injection lines come out of the pump - under the high pressure head. If you see two wires going into a solenoid, in-line with the axis of the pump, it's got a timing solenoid.

This gives maximum advance without any signal, so won't be doing your HG any favours (it's known to kill HG on Rovers with this setup if left faulty). It's controlled by a PWM signal, and can be controlled far better than any mechanical timing advance.

Retrofitting an ECU that can control this usually only takes a few wires, and can give much better economy and power response

Pwm you say eh? Hmmm, prob not too difficult to hook up to the arduino...