I am pretty sure my 4th gear switch for the OD is shot. I can ground the wire going to it from the relay and hear things clicking. So it seems that this needed ground is not being supplied.

I have called/checked everywhere and this item is no longer available. There is a guy on EBay who claims to have them but after making a purchase he responded 5 days later saying he doesn't have them after all. So that isn't an option.

I have considered adding a manual switch to ground on the dash panel somewhere. But with my aged, addled mind I am concerned that I might not always do the right thing and mess up the OD unit.

I may be able to get one from a junkyard somewhere. But I would really like to get a new one. Any suggestions?

A guy at IPD said that some Datsun cars used the same switch. But I don't know which models/years/part number. And this could be an urban myth.

Thanks for any pointers.