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Thread: Gq Speedo adjustment to read correct speed

  1. #1
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    Gq Speedo adjustment to read correct speed

    I just adjusted my speedo on the GQ dash. I was sick of it reading 8km low at 100km.

    Instructions.

    Pull the cluster out -

    You need to drill a hole in the TOP WHITE part of the cluster assembly.

    1. Take a straight line to the top of the speedo cluster from the 90 Km mark on the speedo. Continue the line towards the circuit board at the back of the speedo.

    2. 15 mm from the rear circuit board drill a 5 mm hole - in the white housing where the line above intersects.

    3. If you have the hole in the right spot you will see a variable resistor when you look though the hole - there is only one on the speedo circuit board.

    Re-assemble the cluster and install back into the GQ - leave the screws out.

    To adjust -

    Lean the cluster forward, use a long small blade driver and a tourch to see. Turn the trim pot - (does not need a lot of movement). male an adjustment and go for a drive.

    Calibrate against a GPS - I had my son reading out the GPS speed while I watched the speedo.

    I found that when I was holding the cluster with the display towards me

    Anti-clock wise increased the displayed speed.
    Clock wise decreased the displayed speed


    The speedo is now reading 100km at 100km
    1991 GQ LWB 4.2 Carby dual fuel, 32 mud claws, 2 inch lift, LSD's front and back

    And its Toooooooo High for the Ball & chain

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  4. #2
    Advanced jayisbikes's Avatar
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    thanks GQ TANK, I just fitted 285/75R16s so I'll give it a shot tomorrow :-)

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    Advanced jayisbikes's Avatar
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    Adjusted it yesterday. My potentiometer was located in line with the 95km/hr mark on the speedo. Easily found it by popping the front clear housing off the front of the instrument cluster. Thanks again :-)

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    Quote Originally Posted by GQ TANK View Post
    I just adjusted my speedo on the GQ dash. I was sick of it reading 8km low at 100km.

    Instructions.

    Pull the cluster out -

    You need to drill a hole in the TOP WHITE part of the cluster assembly.

    1. Take a straight line to the top of the speedo cluster from the 90 Km mark on the speedo. Continue the line towards the circuit board at the back of the speedo.

    2. 15 mm from the rear circuit board drill a 5 mm hole - in the white housing where the line above intersects.

    3. If you have the hole in the right spot you will see a variable resistor when you look though the hole - there is only one on the speedo circuit board.

    Re-assemble the cluster and install back into the GQ - leave the screws out.

    To adjust -

    Lean the cluster forward, use a long small blade driver and a tourch to see. Turn the trim pot - (does not need a lot of movement). male an adjustment and go for a drive.

    Calibrate against a GPS - I had my son reading out the GPS speed while I watched the speedo.

    I found that when I was holding the cluster with the display towards me

    Anti-clock wise increased the displayed speed.
    Clock wise decreased the displayed speed


    The speedo is now reading 100km at 100km
    Does anybody know if this is possible on a GUll?

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    Does anyone have some pictures? it would be much easier then....

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    Don't think it will be possible on the GU, they use a microcontroller (computer chip) to read the speed and move the dial. The GQ used all analogue circuits, that is why it has the potentiometer.

  9. #7
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    Just change the VSS drive cog in the gearbox to the correct number of teeth.
    Easier, simpler, quicker but you are up for the cost of the dinky little gear.
    Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.

  10. #8
    Expert Majestic's Avatar
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    Mine is 5KM out since putting 33" on, so this is of interest to me. Thanks.

    Quote Originally Posted by Grzesiek3M View Post
    Does anyone have some pictures? it would be much easier then....
    Yeah pictures would really help us novice types out.

    Owner of 1984 SD33T MK Patrol
    Owner of 1989 TD42 GQ Patrol
    Previous Owner of a 1988 TB42 DA Maverick
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    WARNING: Towballs used for recoveries can, and do kill people and damage property.

  11. #9
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    Thanks GQ Tank

    Spot on. My cluster has already a hole in the right spot. Now to fiddle. Cheers Tractor

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