I am having trouble wrapping my head around how to get my speedo and odometer to function correctly. The math is simple and I've got all the data but I am at a loss as to how the factory tune "works". I'm working on a 2007 LE5 Ecotec (E67 ecm) with a Getrag F23 manual transmission . The final drive gear ratio is 3.84 and the tires are 24.6" (P215/45ZR17") The picture contains the base tune values which appear to all be incorrect except the [ECM] 9002 - VSS Pulses Per Rev at 29.000. I've been searching around on the forums and found a post or two that are very old but I just cant wrap my head around the programming.

Any help would be greatly appreciated.