I wanted to add another endorsing thumbs up for the Lutz calibration devices for my 1995 Series 80. My FZJ is on 35" x 10"r17" Kenda Klevers and I had it regeared by Valley Hybrids to 4.88s. Prior to the calibration, I made several calculations at 5 MPH increments from 30 MPH - 80 MPH and determined with my tyre & gear combination, I was actually traveling (GPS) 7.6% under what the speedometer read. The Lutz device came with a formula which revealed the exact same percentage under. The Lutz is adjusted by 2 buttons, one is +0.5%, the other is -0.5%. In my case, this equated to 15 presses of the -0.5% button.
After installing, I turned the ignition to the ON position, pressed the -0.5% button 15 times, closed it up and went for a drive. It was interesting to find out that GPS is slower to react than the speedometer. My truck is now showing the correct speed & odometer mileage. This is a great product. The installation and calibration process was very easy.
After installing, I turned the ignition to the ON position, pressed the -0.5% button 15 times, closed it up and went for a drive. It was interesting to find out that GPS is slower to react than the speedometer. My truck is now showing the correct speed & odometer mileage. This is a great product. The installation and calibration process was very easy.