I missed your question on the TPS,

p1= +5V
p2= vref
p3= idle switch
p4= signal ground

For MS pin 3 has no use.
Pin 4 ground is to the ms board, not chassis or engine.
Generally there should not be +12V near any sensor.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.