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Matt, So that means the switch doesn't have anything to do with the engine operation it just tells the FASS unit to power up when the oil pressure gets to a certain point? In that case I would do what you are doing and wire it to the switch. That also means that a lift pump and filters may...

The model for the 855 Cummins requires an oil pressure switch so that leaves out doing it with cheaper parts I guess. $697 for the FASS unit.

Let's say for a second that their marketing and research is correct, couldn't I just get an Airtex pump and plumb it and a filter and a separator in for a lot less money? Seems to me that $200 is more palatable than $650 if you got the same results.

Interesting. Would the same thing work for an M813?