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Thread: A0 High Speed Gears - Speedometer Dip Switch Adjustment

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    Default A0 High Speed Gears - Speedometer Dip Switch Adjustment

    Does anyone know the proper dip switch sequence on the back of the A0 speedometer to adjust for high speed gears? Thanks

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    This is something I've been wondering too so I just Googled it and found this https://www.thetruckersreport.com/tr...speedo.162567/ If you try it first let me know what you figured out and I'll do the same.

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    ping

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    Did you not find it in the TM?
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
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    Quote Originally Posted by simp5782 View Post
    Did you not find it in the TM?
    The TM's only show the stock position of the switches.

    Speedo dip switches.JPG

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    Ok. Logical question is to consult the TM first. if that is no help. Then here we go.

    I am going to assume you could calibrate it as you would a 10 switch VDO gauge using pulses per mile vs actual miles driven? Speedos all have the same if not near the same calibration per federal law. Especially these styles from what I have read. Easiest way would be a place that is certified for calibrate speedos. Since they have a roller they could put it on and do it all without leaving the shop.

    http://www.nsifleet.com/pdf/OldElecSpeedo.pdf

    This seems to kinda run the way it should. I don't know the exact make of the speedo on these things.

    According to the TM it would 34754/35180 = 0010011010 for a stock setup.
    Last edited by simp5782; 10-31-2017 at 18:09.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Quote Originally Posted by simp5782 View Post
    Ok. Logical question is to consult the TM first. if that is no help. Then here we go.

    I am going to assume you could calibrate it as you would a 10 switch VDO gauge using pulses per mile vs actual miles driven? Speedos all have the same if not near the same calibration per federal law. Especially these styles from what I have read. Easiest way would be a place that is certified for calibrate speedos. Since they have a roller they could put it on and do it all without leaving the shop.

    http://www.nsifleet.com/pdf/OldElecSpeedo.pdf

    This seems to kinda run the way it should. I don't know the exact make of the speedo on these things.

    According to the TM it would 34754/35180 = 0010011010

    That's very helpful. So based on the chart the stock LMTV speedo is set at 0010011010 which is 34754-35180 pulses per minute. In my truck 50mph on the speedo is about 63mph +/- on the GPS which is a 26% gain. Does that mean we should program in a 26% lower pulses per minute which is roughly 27777 or 0010101111? Does that sound right?

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    Quote Originally Posted by Rebuilder View Post
    That's very helpful. So based on the chart the stock LMTV speedo is set at 0010011010 which is 34754-35180 pulses per minute. In my truck 50mph on the speedo is about 63mph +/- on the GPS which is a 26% gain. Does that mean we should program in a 26% lower pulses per minute which is roughly 27777 or 0010101111? Does that sound right?
    I would start at 30341s binary and see where you stand.

    Gps on the phones can be off. Mine is 2.2mph off from my garmin gps and 1mph off from my other android using the same gps app.

    Or find a Honda civic at night with the center dash speedo display and pace it!
    Sent from my SM-G935P using Tapatalk
    Last edited by simp5782; 10-31-2017 at 18:24.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Quote Originally Posted by dronsen View Post
    Does anyone know the proper dip switch sequence on the back of the A0 speedometer to adjust for high speed gears? Thanks
    I finally got around to figuring this out. Took a few hours of messing around and basically just guessing but it worked out in the end. I tried the test in the VDO doc listed above but it didn't work so I just started switching and testing. Side note... you have to turn the truck off and back on for the switch to take effect so driving around and flipping switches doesn't work.

    If the pics ever disappear the correct setting is 1101101001 (1=up/on 0=down/off)


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    @Rebuilder When playing with the settings did you happen to find one that indicated about 10% faster than actual speed with the 307's??? I went to 14x20 tires which has my speedo off by 5mph at 60 compared to GPS.

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