Any way to to replace it with one that will read accurately. I've heard of using the duramax one I think???

There is not. The ECM is programmed for a switch and not a sending unit. 

The only way to get real oil pressure is an aftermarket gauge. 

There is not. The ECM is programmed for a switch and not a sending unit. 

The only way to get real oil pressure is an aftermarket gauge. 

 

 

Idiot gauge just like the 2nd gens.

You can install a pipe T to retain the OEM function & give a tap for an after market guage.   I used to see this often on flybridge cruisers with 2 sets of guages (upper & lower) stations.   The "sending unit" was actually a variable resistor to ground...  power was fed from the instruments to the "sender".  There were some that had the same resistance values & others that were not.  No master list I'm aware of.

Eventually, I've had sender diaphrams fail & leak oil...  The switches don't usually leak but can still fail. 

The oil light switch is just a grounding switch.

Edited August 20, 20159 yr by flagmanruss

OKAY! Thanks

I am pulling my oil pressure reference from a plug in the cam journal which is just above the ECM.