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A0 High Speed Gears - Speedometer Dip Switch Adjustment
I Googled Ametek 900 speedometer calibration. There is a 20 page document that might be helpful if we have some of the numbers required to get to get to the chart. If the stock tire size is used 33.64" diameter and the 3.07 axle ratio N calculates out to 246. Then this chart is supposedly... -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
Code is beyond my level of electronic expertise :-( -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
I have 2 different apps that use GPS for speed and they don't always match, so I would have to use mile markers over a longer distance to get an accurate reference. A 14x20 tire is 1.427 x the diameter of the 395/85 R20, or a 150.79" circumference vs a 105.68" circumference, or a 42.68% increase... -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
I thought the 3.07 setting was figured out? Will have to figure out 3.07 with 48" tires... -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
Will be interesting to see what you find. -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
Once the gear swap is done I'll play with the settings to see if I can find one for 3.07 with 14x20 tires.... -
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A0 High Speed Gears - Speedometer Dip Switch Adjustment
@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.