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Thread: oil pressure dash gauge - which wire is it?

  1. #1
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    oil pressure dash gauge - which wire is it?

    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?


    oil_p_wires.jpg
    '03 Silver Birch. Stock rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. 8 rib serp belt upgrade i/p.

  2. #2
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    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..
    '03 Silver Birch. Stock rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. 8 rib serp belt upgrade i/p.

  3. #3
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    Quote Originally Posted by azgolfrat View Post
    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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  4. #4
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    03Merc, Thanks!
    test light? Like a connect tester?
    Here is a pic of the wiring diagram I just found

    oil_p_wires.jpg

    Looks like white/red goes to the sensor
    Red / yellow is ignition
    black is ground.
    Agree?
    Thanks again
    '03 Silver Birch. Stock rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. 8 rib serp belt upgrade i/p.

  5. #5
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    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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    SOLD 12/31/2021

    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  6. #6
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    JB..thanks.
    I will solder the eyelet as you describe.
    Is it the rule that RD/YL is keyed voltage?
    '03 Silver Birch. Stock rebuilt 4.L 32V DOHC, V7-JT blower w/ADTR racing supercharger kit, Shift kit in transmission, stainless works long pipes and cat backs, Ridetech coil-overs front, shocks in back (ADTR kit). Rebuilt calipers, upgraded front rotors, OEM Mercury wheels, [boost, oil P, WB fuel/air, and fuel pressure] gauges. Build duration was Dec 2019 to Mar 2022. 8 rib serp belt upgrade i/p.

  7. #7
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    AFAIK only at the pod gauges.


    Sent from my iPhone using Tapatalk Pro
    SOLD 12/31/2021

    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  8. #8
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    Great information!


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  9. #9
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    Quote Originally Posted by azgolfrat View Post
    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?


    oil_p_wires.jpg
    You 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!

    Sent from my SM-N950U using Tapatalk
    Ride 1: 2003 300-A MM, black (naturally), K&N cold air, Granitelli Racing coils, Kybe shocks, Autometer "real" oil pressure and voltmeter, 14 inch front rotors and stainless lines from TCE with 6-piston Wilwood calipers and Hawk HPS pads, cryo-treated slotted rear rotors with TCE stainless lines and Hawk HPS pads, tune by Lidio, LED headlamps. Coming Soon: LED foglights, 200 Amp Alternator.

    Ride 2: 2001 Kenny Brown "Panther 2" Crown Victoria, Black. K&N cold air intake to Allen Engine Development supercharger system with water-to-air intercooled Eaton MP-90 at 8 pounds. Extensive chassis bracing, Brembo 4-piston front calipers on 13 inch rotors with stainless lines. Trunk-relocated Optima Red-Top. 5000K Bi-Xenon HID's. And much, much more.

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