How many using an A500 overdrive ?

I’m working on getting my 46rh ready as well but I have a question on piping up the pressure switches. Do the OD and LU switches need to be grounded to the transmission through the pressure port piping? I hope I’m sayoing this right. If I use brass fittings to pipe my pressure switches and use thread sealant is that ok? Are npt brass fitting threads self sealing? Just wondering because the pressure switch needs the ground wire attached to complete the circuit to activate the solenoid correct? So does the switch base need to be grounded to the transmission case?
Any pictures would be greatly appreciated.

Will start a new thread to address these head scratching questions.