Oil pressure sending unit
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Senior User
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From: Kamloops BC
Oil pressure sending unit
I recall reading that Ford put a switch type sending unit instead of a variable sending unit in many of the F150's. I checked my truck (1995 F150 4X4 302) and the gauge goes to half way which looks good but it never changes. This tells me I've got the switch version. Is there a sending unit that will give me a variable readout using the stock oil pressure gauge? Anyone got a part number if it is a quick swap and the stock gauge is compatable?
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
Yours does indeed have the switch. I replaced mine with a gauge sender and then soldered a solid core wire across the 20 ohm resistor on the back of the OP gauge. But my truck is a 1991 and had the resistor externally. Don't know if yours does also or if it is integral to the gauge.
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From: Kamloops BC
Thanks jas88,
Was the sending unit from Ford or was it aftermarket? I'll look in my manual tonight to see if I have that resistor on the surface to be able to jumper. It makes sense that a predetermined resistor value will give you mid scale reading and if the switch opens the gauge goes to minimum.
Was the sending unit from Ford or was it aftermarket? I'll look in my manual tonight to see if I have that resistor on the surface to be able to jumper. It makes sense that a predetermined resistor value will give you mid scale reading and if the switch opens the gauge goes to minimum.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by MEDF150
Thanks jas88,
Was the sending unit from Ford or was it aftermarket? I'll look in my manual tonight to see if I have that resistor on the surface to be able to jumper. It makes sense that a predetermined resistor value will give you mid scale reading and if the switch opens the gauge goes to minimum.
Was the sending unit from Ford or was it aftermarket? I'll look in my manual tonight to see if I have that resistor on the surface to be able to jumper. It makes sense that a predetermined resistor value will give you mid scale reading and if the switch opens the gauge goes to minimum.
It looks like this:
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
I got mine from Advance Auto Parts. You will likely also need an adaptor because the gauge sender is too big to screw directly into the block on the 302. I did this to my Bronco as well (302-equipped) and I had to get the adaptor from the Ford dealer.
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From: Kamloops BC
Thanks all, I'll have a real oil pressure readout by the weekend. I can see using the switch with an idiot light, but what was the thinking when you had a gauge? You gotta wonder...........
Cargo Master
Joined: Apr 2003
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From: Too close to Houston
You can get the adapter from Ford, but it's cheaper to go to the hardware store and get a 1/4" x 4" galvanized pipe nipple and a 90° ell. When you put the teflon tape on everything leave the first thread exposed so you'll be sure to get a good electrical ground.
You can make the ell up onto the nipple before installing, but the sending unit will have to be attached after the adapter is mounted. You will also have to get an oil pressure switch socket to remove the existing switch.
You can make the ell up onto the nipple before installing, but the sending unit will have to be attached after the adapter is mounted. You will also have to get an oil pressure switch socket to remove the existing switch.
Last edited by Sport45; Jan 11, 2007 at 11:19 AM.
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