42/46RH pressure switch piping dilemma

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 saying 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? I’ve ground the truck mount boss off the case for added room.
Mock up pics for your enjoyment...lol.
Any pictures would be greatly appreciated.

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