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Thread: Gauge install

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    Default Gauge install

    Hey yall. Been a while since I posted and I was thinking about you so here is what I'm doing tonight, changed the thermostat out earlier and now I am trying to install some gauges. I'm doing a mechanical oil pressure gauge and a voltometer so my question is where is everyone running through the firewall? And also how many washers should I put inbetween the coil pack plate and the head to space it out? Thanks


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    change that thermostat housing to a 98 style while you are at it
    We're gonna ride the race cars
    We're gonna dance on fire

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    Quote Originally Posted by dareall View Post
    change that thermostat housing to a 98 style while you are at it
    Wanted to but don't have one on hand. Maybe next time. She just clocked 250k


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    Instead of washers to space off the bracket I notched out the coil bracket where you have the hole drilled and used a 90 deg fitting in the head.
    You can get a 90 deg compression fitting almost anywhere.
    Pointed it up. There is enough space to get the line mounted and then put the coil back.
    I ran through the firewall where the clutch master cylinder would have been (ATX).
    Looks like you cant do that.

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    Yeah too late. Broke the first compression fitting off on the hose side so I tracked another one down and got the line ran into the car. I'm also installing a voltmeter along with the oil pressure gauge on my pillar and I need to know what color wire on the dimmer light harness goes to the dash cluster and controls the brightness. I also need to know what color the ignition switched side of the ignition wire is. All help and input is appreciated thanks


    Tape on the plastic oil line was for protection when I shaved some of the coil pack off btw (4am)




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    Default Gauge install

    Also in these instructions it only shows a red and black for the voltmeter, but there is also a green wire and no instruction on where it goes to so does anyone have an idea?


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    Be careful and keep an eye on those plastic lines. WHEN, not IF they start to leak, people try and tighten them more which piches off the plastic and eventually they break.

    My guess for the green wire would be for illumination. Where does they say to connect the green wire on the oil/temp gauge?


    1 running Ford out of 5 isn't bad, right?

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    Quote Originally Posted by ZX2.0 View Post
    Be careful and keep an eye on those plastic lines. WHEN, not IF they start to leak, people try and tighten them more which piches off the plastic and eventually they break.

    My guess for the green wire would be for illumination. Where does they say to connect the green wire on the oil/temp gauge?


    1 running Ford out of 5 isn't bad, right?
    I don't have a oil pressure green wire. Just red and black. Voltmeter works perfect I have it installed. The oil pressure backlight comes on on start up but when I turn my headlights and markers on the back light shuts off so it's basically opposite of what I want. I hooked it up to the red wire with a black stripe coming out of the dimmer switch but I might put the red/black back to normal and try the green wire. Any suggestions? Here are some pics and yeah I figured these flimsy lines were prone to kinking and cracking. I Have had these gauges sitting around for a while and just threw them in cuz I hadn't torn the car apart In awhile and wanted a little project. Been running too smooth lately. One last thing, what is typical oil psi for a pretty stock s/r?







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    I get about 70-80 on first start up and around 50-60 cruising on the highway. I am turbo'd but still stock internals

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    Quote Originally Posted by MN_zx2 View Post
    One last thing, what is typical oil psi for a pretty stock s/r?



    Quote Originally Posted by MN_zx2 View Post
    I don't have a oil pressure green wire. Just red and black.
    Yes, I realize this, but what I was getting at is.... on your instruction sheet it gives a wiring diagram for their oil/ water temp gauge which shows a red, black, and green wire (same colors as your voltmeter). Where do they say to hook up that green wire? If it goes to an electric temp sensor, then disregard. If it shows connecting to some part of the illumination circuit in the car, then I would see if that gets you the correct results.

    I just pulled my dimmer switch out and did some tests. I interpret the above wiring diagram this way...
    -RED W/ BLACK wire is gauge cluster illumination +12v
    -RED wire and GREEN wire is ground side for those bulbs which goes through the dimmer switch rheostat and then to ground through the BLACK wire. The dimmer does NOT control how much +12v is going to the bulbs, but rather back feeding a variable amount of voltage to the other side of the bulb. If a bulb has 12v on both sides it's off. If it has 12v on one side and 10v on the other, it's dim. The lower the back feed voltage, the brighter the light.

    And, since you connected the oil gauge black wire to the RED W/ BLACK car wire, when you turned the lights on you had +12v on each wire. Therefore no ground and the lights went out. If you connect the oil gauge RED wire to RED W/ BLACK and the oil gauge BLACK wire to either the RED or GREEN dimmer wire, you will have dimmable oil gauge light.

    The voltmeter is a different story. It most likely shares the BLACK ground wire for both the voltage ground and the illumination ground. The GREEN is +12v illumination. If you connect the GREEN gauge wire to either the RED or GREEN dimmer wire, it will work backwards of your dash gauges. The brighter the dash, the dimmer your voltmeter.

    The only solution I can think of, if you want dimming capability, is to splice a wire from the RED W/ BLACK dimmer wire to a seperate small dimmer (potentiometer) inline to oil gauge RED and voltmeter GREEN. The pot would need to be about 50 ohm and 3 watt or higher rating.

    If anybody finds something wrong with anything I wrote, feel free to point it out, as I'm still learning my way through electrical

    1 running Ford out of 5 isn't bad, right?

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    Cool I'll have to jump back in there then thanks for the help. Couldn't find my manual or a schematic that made sense to me anywhere while I was doing it. The voltmeter works perfectly as far as I can tell so idk what the green wire was about. It was a cheaper volt gauge from china I'm sure so maybe they have just generic wire harnesses because like you had mentioned before it goes to a sensor


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    What wire do you have the green wire on the voltmeter connected to?

    1 running Ford out of 5 isn't bad, right?

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    Default Gauge install

    Quote Originally Posted by ZX2.0 View Post
    What wire do you have the green wire on the voltmeter connected to?

    1 running Ford out of 5 isn't bad, right?
    Not connected. It was a part of a harness that was pinned into the back of the gauge and I didn't even look to see if the gauge had a receiver pin for the green wire or if it was just the 2.


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    Quote Originally Posted by MN_zx2 View Post
    Not connected. It was a part of a harness that was pinned into the back of the gauge and I didn't even look to see if the gauge had a receiver pin for the green wire or if it was just the 2.


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    So the voltmeter only has 2 wires, then?

    1 running Ford out of 5 isn't bad, right?

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    Quote Originally Posted by ZX2.0 View Post
    So the voltmeter only has 2 wires, then?

    1 running Ford out of 5 isn't bad, right?
    Okay so the voltmeter itself (just the gauge) has a female port on the back for a male wire harness fitting. That wire harness that came along with the voltmeter has a red, black and green. However only the black and red are hooked up just like the instructions said. The red wire from the voltmeter is wired to the big blue wire(I believe is the ignition wire) under the steering column and the black is wired into the red black wire from the dimmer. Both are positive connections so could the green wire from the harness(currently unconnected) just be a simple ground?

    The oil pressure gauge has 2 wires which are for the backlight since it's a mechanical gauge. Black goes to ground and the red is tied in with the voltmeter black wire at the dimmer red/black wire(which should be tied into the green wire form the dimmer). Once I take the red from the oil psi gauge and put it on the green wire it should be perfect



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