I have a 1970 Westfalen imported from the US. It came with reversing lights but they have been wired up as indicators. I have fitted red & Amber rear oval lights which incorporate the stop/tail & indicator bulbs etc. I intend to make use of the fitted white rear light units for reversing lights. I have had a look at the gearbox but cannot find any reverse light switch. There is what looks like a hexagon plug on the front left hand side of the gearbox. If I remove this will I be able to just screw in a new reverse light switch & connect up the necessary wiring to get fully auotomatic reverse lights? Thanks for your help. Mike