how to test oil pressure sender and gauge

[motornut]

Originally Posted by Skunksmash

Is it me, or did so many of those old seat belt lights fail? So much that often, the seat belt light just stopped working completely.

that old seat belt light and the headlight/seatbelt buzzer,were usally the first things I removed
funny how now it's cool (to me) the 79 seat belt light actually works lol (buzzer no)

[UATahoe]

On finding the wire for the dash gauge, was it normally close to the O2 sensor wire? That is the only connection i can find. Right now, this is the only wire i havent accounted for.

[motornut]

Originally Posted by UATahoe

On finding the wire for the dash gauge, was it normally close to the O2 sensor wire? That is the only connection i can find. Right now, this is the only wire i havent accounted for.

reading my 81 service book, i only see the one, "tan" says "oil" "only used for gauges"
idiot oil is still blue

[UATahoe]

Will readily admit colors aren't my strong suit. Lol. Would you consider the wire pictured to be tan?
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[motornut]

Originally Posted by UATahoe

Will readily admit colors aren't my strong suit. Lol. Would you consider the wire pictured to be tan?
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honest ,looks bright for tan,almost orange (compared to cluster plugs wires)
any volts on that?might be the alt wire?

[UATahoe]

Haven't checked it. It's way too short to reach the alternator. It's right next to the o2 sensor wire which goes to basically the exact right spot. The orange is definitely brighter. The other sensor has an orange wire which is much brighter and a definite orange color. I honestly have no clue though.
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[motornut]

Originally Posted by UATahoe

Haven't checked it. It's way too short to reach the alternator. It's right next to the o2 sensor wire which goes to basically the exact right spot. The orange is definitely brighter. The other sensor has an orange wire which is much brighter and a definite orange color. I honestly have no clue though.
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was it a 6 harness?
would that make it not reach?
o2 in a 80? we don't have that here
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[UATahoe]

No it's an 87. The wire I showed runs straight to the sender. It's a single wire that is in the main harness loom.
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[motornut]

ok that explains it
just reread I thought it mentions for an 80
but I see now it is an 87
one thing with some the oil pressure is wired to the fuel pump
so no oil,no run
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[UATahoe]

Yep. My truck has 2 oil pressure sensors. One senses pressure and then kicks on the fuel pumps. The second reads the pressure and sends to the gauge.

The oil/fuel sensor is located behind the distributor. The one for the gauge readout needs to mount above the oil filter.
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[motornut]

this is the sensor plug off the back of my 87