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...
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...