Hoping someone here can help me out that has hands on use with the ProCal module.
Got it today, measured tires like instructions say. Reprogrammed and I was doing 8mph under the speed limit, with truck set to cruise control, per GPS. Pulled specs on tires, recalibrated with tire spec size and now I'm doing 3mph under the limit, again, verified with GPS.
My tires are 325/65/r18 which is a 35 inch tire dimension per manufacturer specs. They measured at 33 1/2 (following the ProCal instructions), which they've been on for a yr and a half so wear taken into account there.
Who here has reprogrammed and verified using GPS their speed to see if it's exact? And I use my GPS for work and in my work vehicle the speed I'm going matches GPS, so I know GPS speed is accurate.
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