Ooops, I was wrong about the pressures. I went back and did some digging.

For the gauge, I purchased it from Summit. It's part # ATM-2634 . I had to get a metric adapter ATM-2269 and a 1/8npt t-fitting. I also bought an low oil pressure kill switch from Summit part# SUM-G1438 . I'm using this switch to activate the idiot light ONLY. It operates at 7psi vs the factory 5psi AND it has a 1/8npt fitting on it, which made it easy to thread into the above t-fitting.

'06 Dakota QC 4.7 6sp 4x4
'88 Mighty Max
'77 KZ1000 fun old bike