Tapping into oil pressure system

Find the oil sensor on the engine, remove it and tap in there.
Will tell you how accurate your gauge is, where if you tap in somewhere else it may be out a couple pounds one way or another from the oil sensor hole.

 

Easiest way is to remove oil pressure sensor and install the test fitting. Oil Pressure Test Fitting tool number is, 12-889-02.

 

Do we need that tool to remove and install the oil pressure sensor?

 

No, standard tools.

 

@Heavyd If I remove the oil pressure sensor to Put a manual gauge on, how can I stop the truck from shutting off due to no pressure?

 

Why not just use a tee fitting? Put the pressure sensor in one port and the test gauge in the other?

 

I was actually trying to google one but I’m not entirely sure of the size of fittings and stuff needed

2016 n13 645k miles
Deleted (not sure if a tune could be throwing the ecm off)

for context my truck has an issue with oil pressure under load and high temperature

I’ve replaced my entire oil cooler module with the crank case breather oil cooler etc

My pressures by gauge are as follows

before module
Cold Start idle 40 psi
Cold rev 48-50 psi
Bobtailing 1500rpm 40 psi
Heat soaked 1500 rpm 28-40 psi
Hot idle 8-15 psi

after module
Cold start idle 40 psi
Cold rev 60-70 psi
all Other pressures are the same as before the module change

the truck doesn’t knock (I may have heard a knock one time before it shut off but it could be my paranoia)
or do anything else abnormal it logs code spn 100 fmi 18 religiously over 50 counts last time I checked the codes via dashboard

other things I’ve done
Checked the voltage the sensor was putting our by back probing the wires

this was in tune with what the ecm is seeing

other random things that may be related the truck is pretty wacky with all of the gauges that I believe are ran through the canbus/ecu

fuel gauge jumps around
Speedo jumps around
Coolant temperature never goes above 140 degrees unless I’m in a hill pull with weight Jpro matches all figures the cluster is showing me

(I’ve changed out coolant sensor for a new one and jumped the two pins together which pegged the coolant gauge to hot)

voltage gauge
Air pressure gauges
Rpm are all accurate and stable

so with all that being said it’s strange that the oil cooler module would only have an effect on cold start revving.

also I can recreate any of the pressures I listed above which tells me it’s pretty consistent

 

We leave the sensor unplugged and reprogram it for warning only.

 

@Heavyd hey I haven’t been able to test the oil pressure yet but I do have a question


My multimeter is showing 20-30v on the ect and the eop negative wires when grounding them to the engine block

however it shows .2-.3 volts when grounding the negative wires back to the battery.

can you make any sense of this ? Chat gpt thinks I either have a bad sensor back feeding the ecm or a bad internal ground in the ecm

also not sure if I stated this before but it will sometimes go on a frenzy popping the 5amp ecu fuse on the dashboard

like it’ll pop it 6 times in an hour and then not pop it for weeks