Oil Pressure Sending Unit Location - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 03-10-2006, 06:48 PM Thread Starter
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Oil Pressure Sending Unit Location

Does anyone know offhand where the factory oil pressure sending unit is located on a 1995 F350 7.3L? My gauge just started acting up (either that or my oil pressure keeps intermittently dropping to almost zero, and there is plenty in the pan). Is there a recommended alternate spot to tap in with a reference gauge?

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Michael Pliska

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1995 F350 PSD Crew Cab Dually, 271k miles
10 ISSPRO Prototype Performax™ gauges in Pillar & Overhead pods & sitting on dash, Tymar Intake, Gutted EBPV, Tymar 3x4" downpipe, Tymar 5" exhaust, Cat's hiding in the shed, Baby Swamps, Swamps tunes, Tricumulator springs and Accumulator Valve, Tru-Cool 4590 Trans Cooler, Lock-Right Locker
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post #2 of 7 (permalink) Old 03-10-2006, 10:38 PM
BJS
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the oil pressure sending unit is ontop of the HPOP reservoir on the passenger's side.

easy to get to on top of the engine

95 F350 Centurion Conversion Bronco (Crew Cab SRW) 4X4 4.10, Isspro Performax Boost, Pyro, & trans temp on the A-pillar, BDP Stage 1 injectors, Open air intake, Dpp Downpipe, Self built E4OD with parts from Racer-X, Tony Wildman Chip, Early '99 Intercooler.

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post #3 of 7 (permalink) Old 03-12-2006, 04:43 PM
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Here's a pic! The one on the left is the factory sensor, its behind the water line in this shot...
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post #4 of 7 (permalink) Old 03-13-2006, 05:04 PM Thread Starter
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Joe,
Thanks for the photo. What thread is the hole where you added the aftermarket sending unit? It looks like you have an adapter in there before the pipe thread elbow.

Mine turned out to be just some corrosion on the terminal of the factory "sending unit". I didn't realize that it was only a pressure switch (though I have wondered why the oil pressure always seemed to be the same). That factory gauge is just a placebo! Time to add space for more gauges, as I will be adding a real oil pressure gauge to mine.

Thanks,
Michael

ISSPRO Engineering Manager

1995 F350 PSD Crew Cab Dually, 271k miles
10 ISSPRO Prototype Performax™ gauges in Pillar & Overhead pods & sitting on dash, Tymar Intake, Gutted EBPV, Tymar 3x4" downpipe, Tymar 5" exhaust, Cat's hiding in the shed, Baby Swamps, Swamps tunes, Tricumulator springs and Accumulator Valve, Tru-Cool 4590 Trans Cooler, Lock-Right Locker
1998 S&S 9.5' slide-in camper
32' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET Super-Pro)
1992 GMC Typhoon, 1973 Chevy Blazer with Pontiac 400, 1973 Trans-Am 455
2000 VW Jetta TDI - Kerma tune, Der Chimera Stage II Clutch
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post #5 of 7 (permalink) Old 03-13-2006, 11:05 PM
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Its an AN-4 type fitting. What ever that means... I made four trips to Fluid connectors to get the right one...

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #6 of 7 (permalink) Old 03-14-2006, 09:56 PM
 
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there is a 1/8th npt fitting on the back of the block... within a half inch of the bellhousing, it is located on a "ear" that sticks out where the starter would be (only on the opposite side), it is plugged with a square headed plug, it can be removed and a pressure sending unit screwed right in as most of them are 1/8th npt also

this port measures the pressure off the last main bearing right before it goes up to the turbo (the last thing on the loop)... IMO it is the best place to measure pressure because if this place has oil the rest of the mill has oil

and the install is as simple as removing the plug and screwing in a sending unit

if you are interested and can't find the plug let me know and i will post a pic of my truck
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post #7 of 7 (permalink) Old 03-14-2006, 11:53 PM
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Thats a great place,: but thats where I have my oil temp sender mounted:

Red arrow is the oil temp sender, blue is the second port I think your referring to. I was under the understanding that this port was not under pressure:shrug: , am I wrong: ?
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