Being a right hand drive car, I would assume that the electro adjustment knob would be on the other side on my car from yours.

Anyway, I'll describe based on my car. Located near the master brake cylinder, attatched to the firewall, there is a black colored knob with numbers printed in white. This is where I understand idol adjustments are made, at least on my US model 87 300D turbo.

GSXR has posted some info recently about this adjustment. Try the search and see what you may find.

Steve.........