Help... Out of calibration on 94 Toyota Supra gauge cluster

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Thread: Help... Out of calibration on 94 Toyota Supra gauge cluster

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    Help... Out of calibration on 94 Toyota Supra gauge cluster

    Recently, I replaced the cluster for my 94 Toyota MKIV_Supra; speedometer, tachometer and fuel level indication are out of calibration. Anyone knows how to recalibrate. Please, help... Thank you!

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    Very Senior Member Silver Supra's Avatar
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    You will need to post this in the MKIV Forum - Technical subforum, to get some helpful responses.
    '94 T Auto Silver Bullet | 471 rwhp at 15.5 psi |

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    Stock Twins King Stu Hagen's Avatar
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    Quote Originally Posted by ngo10709394 View Post
    Recently, I replaced the cluster for my 94 Toyota MKIV_Supra; speedometer, tachometer and fuel level indication are out of calibration. Anyone knows how to recalibrate. Please, help... Thank you!
    I repair these issues a lot. Let me know the exact issues. I do cluster calibrations all the time

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    Stu, do you calibrate by feeding a steady 400Hz 50% duty signal to the tach and push the needle on at 8000? Ever find that it's accurate at 8000 but not at lower rpm? I've been needing to set mine so it reads correctly.
    1997 GE VVTi 6spd

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    Stock Twins King Stu Hagen's Avatar
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    Quote Originally Posted by Kurt View Post
    Stu, do you calibrate by feeding a steady 400Hz 50% duty signal to the tach and push the needle on at 8000? Ever find that it's accurate at 8000 but not at lower rpm? I've been needing to set mine so it reads correctly.
    I rarely "calibrate" at 400HZ/8000rpms...Why? because the OEM tach is way off at that high and not a lot really care to go that high. I calibrate to what I consider is the "sweet" spot which is 200HZ/4000rpms. That is in between the offsets of the normal tach area. What is shocking is the attachment out of the Supra manual for tolerances. Hence why I do what I do for calibration. This puts offsets in the middle. Low end to read slightly lower and high end slightly higher in offset.

    What I have found is that at lower RPMs the offset is at the lower end like 1000rpm reads 900 and on the high side, like 7000 ot will read 7500/
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    Ugh, that's a pretty wide tolerance. lol Maybe I should just be happy it's close enough. Thanks for all that info, it's really appreciated!

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