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Thread: electronic instrumentation recalibration

  1. #1
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    Default electronic instrumentation recalibration

    has anyone recalibrated an electronic cluster,evtm says "recalibrate" as per shop manual fuel gauge seems low, not real sure on the other gauges

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    apology's it was fuel gauge I was reading. I have the full electronic (digital dash ) as im sure you do in the 20th anv , my issue is the spedo is inaccurate 10 mph + , would you happen to have the part # for the correct one ? i have the correct driven/ drive gears( yellow on trans (t5) and 21 tooth (red) on sensor)

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    this is something i am not the best person to speak to about.
    I've changed speed sensors before,,easy job but,,,,

    i think i know a source.

    my 351 bronco i converted to 5speed and the gear color is yellow.

    the source for the transmission i used was your 89, 90, 91 F100 or F150 etc with the 5 speed Mazda TK transmisison.

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    Quote Originally Posted by 20thanvcat View Post
    apology's it was fuel gauge I was reading. I have the full electronic (digital dash ) as im sure you do in the 20th anv , my issue is the spedo is inaccurate 10 mph + , would you happen to have the part # for the correct one ? i have the correct driven/ drive gears( yellow on trans (t5) and 21 tooth (red) on sensor)
    Well if it's reading too fast you need a drive gear in transmission with less tooth count... Dropping from 8T(guessing that what's inside) to 7T will make a large difference... The 21T driven gear is as many teeth as Ford sells but there is a aftermarket 23T available... That one should slow down reading approx 5-7 mph... Clinker is they are reported to have a short life...






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    If you have a good Ford parts guy they have a formula to figure out the drive gear. You'll need the part number of your trans and your rear gear ratio.

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    Quote Originally Posted by tommym View Post
    If you have a good Ford parts guy they have a formula to figure out the drive gear. You'll need the part number of your trans and your rear gear ratio.
    No parts guy necessary, there are online calculators...


    Here's one from Ford Racing Parts... If calibration is wrong with listed gears there are other factors in play, like tire size or maybe a flaky speedo head...

    https://performanceparts.ford.com/do...UsageChart.pdf






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    ford racing has the formula - and according to the spec, i have the correct setup for my combo --thats why i was wondering about the sensor self , seems it would have to be diffrent for a analog dash vrs the full digital dash ?

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    Quote Originally Posted by 20thanvcat View Post
    ford racing has the formula - and according to the spec, i have the correct setup for my combo --thats why i was wondering about the sensor self , seems it would have to be diffrent for a analog dash vrs the full digital dash ?
    Nope a gear for a T-Bird with analog or digital dash is same, or Mustang, Crown Vic etc... Would be a major kludge if heads were calibrated differently...

    All speedos are calibrated(or at least were, now days it's a whole different game) to read 60 mph at sensor or cable speed of 1000 rpm..


    What is your combination and exact issue(include gear ratio)... Hard to help if all the details are not known...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  10. #10
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    ok :
    t5 trans has yellow gear (7 tooth on output shaft)
    speed sensor has red gear( 21 tooth on speed sensor)
    rear axle is 3.73 gear

    according to ford racing speedometer gear useage chart for 7.5-8.8 axle this is the correct setup
    this is a used electronic cluster reading aprox 10 mph high i:e;reading 85 (and this is max for this cluster will not go to 87-88-89mph )at 75mph

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