I know that the injectors don't have a polarity, the dizzy, tps and cold start valve can only go one way. But I notices that the mps connector can fit either way . There are no indicators as to which side goes with which . Is there a polarity? Experts....,,,,,

nope, either way

There are two coils in the MPS. One goes between the two outer terminals on the plug, and the other coil goes between the two inner ones. So it doesn't matter which way around the plug goes.

--DD