From what I'm reading only the 46re has 5 volts supplied, to pressure/temp sensor. 46rh are solid 12 volt, from what I'm reading. If this is true it will simplify things.

I've also found new 46rh 3 pin pigtails for sale, so will be buying one of those. I don't want to cut into the existing harness because I don't have alot of extra length to play with in that harness.