if you want a pressure gauge, it should be electric to prevent leaking hot oil in the cabin. i use a vac gauge between switching valve and the pump input. this gives readings on both filters.

try egauges.com

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.