I have an MC21 engine in my MC18 and and had connected the neutral wire from the GPS (red/green) to the neutral light wire from the loom, so I can get the neutal light to work with the 21 engine. The light would'nt come on, so I remembered that the neutral switch on the 18 acts an earth to the engine. I connected the red/green wire from the GPS to the engine block, and the neutral light came on , unfortunately now however when I go through the gears it won't go off Any ideas?

I think I have got to the bottom of the problem, I took the GPS out to have a look at it and realised I did'nt fit the GPS properly with the peg in the neutral position after engine rebuild. I have unfortunately broken the peg but it appears to be a small dia cotter pin so not too much harm done this time!

Hi Tim
You certainly wont be the last person to make this mistake,if you struggle to find a pin for your gps I have a complete 21 gps here,
All the best,
jonmac
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John

Thanks for that John, I'll bear that in mind.