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  1. #51
    Join Date
    Apr 2012
    Location
    midlands Uk
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    i got my s15 as a rolling shell that was pretty stripped. any one got a picture? so i can rummage through my box of bits/identify which plug it is.

    the car is going to be a daily so having a gauge that only goes upto 1 bar is fine for my application.

  2. #52
    Join Date
    Sep 2009
    Location
    New Zealand
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    factory boost gauge............. step 1, remove, step 2, throw in bin, step 3, get a better one

  3. #53
    Join Date
    Apr 2012
    Location
    midlands Uk
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    better than nissan OEM quality? wash your mouth out!!.

    i dont need an aftermarket boost gauge as im not going to go over 14psi. plus the OEM one matches the dash clock faces.

    if someone is tinkering under the bonnet tomorrow could you take a picture please!.

  4. #54
    Join Date
    Nov 2009
    Location
    herts,uk
    Posts
    4,468
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    49
    How to remove OEM boost gauge and fit Defi gauge in....
    @Peglio13
    Oem boost gauges have a tendency to die and arent that accurate tbh I would swap it out just get one with orange lit background to match the dash ... SImples
    i will probably be messing with my car later so will get some pics iir
    Last edited by pegliobaglio; 06-10-2012 at 09:19.

  5. #55
    Join Date
    Apr 2012
    Location
    midlands Uk
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    if you could.

    my wallet is a bit bare after building a car so i could do without more stuff to buy.

  6. #56
    Join Date
    Feb 2015
    Location
    Twickenham
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    Would love to know if anyone sussed out the OEM gauge wiring for defi use? Needs on, ignition, illumination and earth.

  7. #57
    Join Date
    Feb 2015
    Location
    Twickenham
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    Hey guys, this thread was super helpful so thanks for all who have contributed. I discovered a couple of thigs along the way that I thought might be worth sharing, particularly re-using the wiring that's already in place for the original OEM boost sensor to give power (sensor is seperate, although there is a small grommet behind the clutch master which makes running that a sinch)...

    Hope this helps.

    S15 Boost Gauge Wiring

    Stolen information from several places on the internet and added a little of my own including pics with the intention of re-using the original wiring that is in place to get my Defi gauge up and running.
    Mostly here: </title> <link rel="shortcut icon" href=/images/"favicon.ico" > <link rel="icon" type="image/gif" href=/images/"animated_favicon1.gif" > <script type="text/javascript"> </script> <script type="text/javascript" src="http://www.freshalloy.com/clientscr


    Pin out


    From the car
    Pin 1 Red/Blue: Illumination power supply. Key-on, 12v with light s/w on.
    Pin 2 Black: Illumination ground. Key-off, 0v.
    Pin 3 Green/Yellow: Ignition power supply. 10A fuse. Key-on, 12v.
    Pin 4 Red/Black: Constant power supply. 10A fuse. Key-off, 12v.
    Pin 5 White/Green: Boost sensor signal. Voltage varies with signal (1.2 – 2.5v approx.)
    Pin 6 Black: Gauge ground. Key-on, 0v.

    Fig 1


    How to remove OEM boost gauge and fit Defi gauge in....-boost_wiring_3557-jpg


    Pin out


    From the boost gauge
    Pin 1 White: Illumination power supply. Key-on, 12v with light s/w on.
    Pin 2 White: Illumination ground. Key-off, 0v.
    Pin 3 Red: IGN - Ignition power supply. 10A fuse. Key-on, 12v.
    Pin 4 Red: Constant power supply. 10A fuse. Key-off, 12v.
    Pin 5 Yellow: Boost sensor signal.
    Pin 6 Black: Gauge ground. Key-on, 0v.h

    Fig 2





    Soldered and connected


    Twist the unused wires together, then strip the wires you will need paying careful attention to the two red wires coming from your plug. One of these will match the Defi colour scheme and the other will match the orange out. I used a sharpie pen to put a black line to make the distinction.

    Fig 3




    The plugs in the photos are oriented such that they would plug in together, and the pins start by counting the side further away from you with two wires first from left to right as shown (1 and 2) and then the closer side with four wires (3, 4, 5 and 6) - I've bolded the wires that match up with the Defi Racer guage as that's what I was fitting. To do the above you will need to cut the wires from your OEM gauge, so if you want to keep it and possibly re-use it then make sure to leave enough wire... For me, mine was too temperental anyway so if I sell the car the next guy gets it. The car deserves a decent boost guage so I'm cool with this and I don't plan on letting it go any time soon

  8. #58
    Join Date
    Aug 2016
    Location
    Glasgow
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    would it be possible to just unplug the original sensor and plug a defi one in instead of plumbing into another part of the engine?

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