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1G Glowshift digital only reads 1 PSI

Posted by gusu, Mar 16, 2019

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  1. gusu

    gusu Proven Member

    1,370
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    Joined Sep 9, 2009
    Keizer, Oregon
    Hey everyone,

    About a year ago I replaced my Prosport gauge with 10ish years of use with a new prosport mechanical gauge when the Prosport gauge died. One day I blew the vacuum line off and it never worked again. So today I installed a new Glowshift digital gauge.

    After installing the new Glowshift digital gauge it will only read 0 PSI just after being turned on. After a few seconds of idling it will start to read 1 PSI and stay there until the car is shut off.

    It is important to note that my car is a 90 1g so the vacuum lines are different. For those of you who know the OEM color coding for the vacuum lines, I am using the red stripped vacuum line that goes into the bottom my fuel pressure solenoid as my boost source.

    Any ideas?

    *edit* I forgot to mention when I unplug the sensor the gauge reads -- so it should be working.
     
    Last edited: Mar 16, 2019
  2. DSMPT

    DSMPT Proven Member

    521
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    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    Try to take the pressure source from intake manifold directly. Some lines where you took from or the lines that connected to the throttle body don't read vacuum.
     
    Last edited: Mar 16, 2019

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    1990 Mitsubishi Eclipse GSX
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  3. gusu

    gusu Proven Member

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    Joined Sep 9, 2009
    Keizer, Oregon
    Is there a source that you would recommend over others?
     
  4. DSMPT

    DSMPT Proven Member

    521
    177
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    You can put a "T" fitting between the intake manifold and the fuel pressure solenoid.
    If you don't see the gauge working correctly after taking the pressure source from intake manifold. Check the wiring once again and apply some pressure to the sensor and see if it is reading the pressure correctly. If not reading the pressure correctly then could be wrong wirings or a bad sensor/gauge unit.
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
  5. gusu

    gusu Proven Member

    1,370
    26
    Joined Sep 9, 2009
    Keizer, Oregon
    After looking at how the 91-94s work and the 90 parts I was able to figure out that a couple of the hoses were crossed. Thanks for your help.
     

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