oil pressure dash gauge - which wire is it?

[azgolfrat]

Hey Guys, I'd like to use the wires from the stock oil pressure gauge to wire my new autometer "real" oil pressure gauge.
I removed the stock gauge from the under dash panel, & took it apart. See photo. The wire ends you see in the photo connect to the old gauge (I cut them).
The shown bulb can go right into the new gauge.
I will run a 16awg wire from the back of the new sender to the back of the new gauge.
BUT...the new gauge needs a power line and and ignition switch line...
I'm not sure which is which of the 3 wires shown..
1)black
2)red/yellow
3)red/white

I've been pawing through my electrical wiring diagrams from shop manual, but I've not been able to figure it out from them.
Anyone know?


51538

[azgolfrat]

Sorry - back of new gauge needs ground, ignition (power) and wire to sender. So 2 of those 3 pictured (leaving out the bulb wires) I need to connect to the back of the new gauge..

[03Merc]

Sorry - back of new gauge needs ground, ignition (power) and wire to sender. So 2 of those 3 pictured (leaving out the bulb wires) I need to connect to the back of the new gauge..

Use test light to find the ignition wire, new gauge needs all 3 wires to work.


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[azgolfrat]

03Merc, Thanks!
test light? Like a connect tester?
Here is a pic of the wiring diagram I just found

51539

Looks like white/red goes to the sensor
Red / yellow is ignition
black is ground.
Agree?
Thanks again

[justbob]

RD/YL - keyed voltage
WH/RD - oil pressure sender
BK - ground

No need to run a new wire to the sensor. Just solder on a new eyelet connector.


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[azgolfrat]

JB..thanks.
I will solder the eyelet as you describe.
Is it the rule that RD/YL is keyed voltage?

[justbob]

AFAIK only at the pod gauges.


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[BLACKMARAUDER04]

Great information!


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[SteelQualityMan]

Hey Guys, I'd like to use the wires from the stock oil pressure gauge to wire my new autometer "real" oil pressure gauge.
I removed the stock gauge from the under dash panel, & took it apart. See photo. The wire ends you see in the photo connect to the old gauge (I cut them).
The shown bulb can go right into the new gauge.
I will run a 16awg wire from the back of the new sender to the back of the new gauge.
BUT...the new gauge needs a power line and and ignition switch line...
I'm not sure which is which of the 3 wires shown..
1)black
2)red/yellow
3)red/white

I've been pawing through my electrical wiring diagrams from shop manual, but I've not been able to figure it out from them.
Anyone know?


51538You can use the existing sensor line, which is what I did. Even if you couldn't, you don't need a 16 AWG wire for a gauge. There is an insignificant amount of current flowing to most kinds of gauge, so a 20 AWG wire would have no real voltage drop over that short a distance and is a lot easier to handle, solder/crimp and stuff through a firewall access!

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