Scott Wilkes wrote on Saturday, April 03, 2010 - 11:31 am:heres a pressure switch in the gearbox, that your selector acts against when in reverse and completes the reverse light circuit.
Not 100% certain which switch it is, as didnt pay attention when i pulled my box to replace the clutch but i think it is this 1
On the side of the box
Test at the plug, if it has continuity when reverse is selected and no continuity when out of reverse then it is ok and something else is amiss