Search results

  1. G

    Need help with Dip switches on back of speedometer

    Ok, I think I got it figured out. Visually it doesn't make sense, but running the numbers it does. Remember my speed was off 17%. So it started with 0011111100 =672 pulses per mile (ppm) I stumbled on a correct setting of 0001101100 = 288 ppm on the chart. But this doesn't make sense as...
  2. G

    Need help with Dip switches on back of speedometer

    I'm bought and modified a firetruck to use over the road. I changed the gear ratio from 4.11 to 3.55. On my test drive, my speed app read 60mph, truck speedo was 50 mph for a difference of 17%. The only info I was able to find on a Prestolite speedometer was...
Top