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Oil pressure sender (RPO) question


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Doing some wire cleanup and chased some wires to to the oil pressure sender. It has an ignition hot going to a switch in the cab and then out to the sender. Any idea why this was done?

 

Ask trying to track down origins wire location. Around same spot near firewall; I have a 2 pin not hooked up and a 4 pin flat that was cut. Can’t seem to find what these are for. Same block of wires has 2 pin to transmission - guessing reverse lights.

 

 

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Non-tach dash 7123s have a CRANK-only (proof out) signal for the oil pressure indicator lamp, which may explain your hot line.

 

The 4 pin flat plug is your engine gauge feed harness: oil pressure, water temperature, coil, and carb anti-stall line.

A blue plug with only 2 wires but square like it should have 4 pins is for your seat belt warning system; a black plug with all four wires that is square is your neutral safety switch/backup light plug.

Let me check your shorts!

http://midlifeharness.com

cactus.jpg.92e5d9d8700abc0ed60c8ccb3426248e.jpg

 

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Car does have a tach but it’s not working. None of the gauges work except for speedometer (another issue

, it’s 10 mph fast).

 

Bought some electrical manuals - just taking a while to read it. Appreciate the info - I’ll keep plugging away.

 

 

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Here is what I have currently

fc2e5e86a1c3bed28cfe336e72c2af5b.jpg

928a99d247b2c1b88c883579cf3e64a9.jpg

 

 

Thinking of buying this online but unsure what wire goes where.

bbda7a8f3c40d3cea66fb7ab0bea003e.jpg

 

Is there a good color coded book I should purchase?

 

Ones from Jim Osborn are decent to look at but not helping me much.

 

Thanks in advance

 

 

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Am I good to just leave the oil sender unplugged (and drive the car)  till I can figure out the dash wiring? I’d just for gauge (which I have a tach), I don’t get why they hooked it to a switch.

Personally, I would NOT drive the car until I got the wiring straightened out.  You may not have indication of no oil pressure without knowing it.  That's a $6k engine bill right there...

Let me check your shorts!

http://midlifeharness.com

cactus.jpg.92e5d9d8700abc0ed60c8ccb3426248e.jpg

 

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