hmm, I have no idea whether my cruise even works or not
But after looking over your most recent topic again, what padgett has to say sounds interesting:
I do know there is a PROM calibration byte for MPH. Would sound like you have a speedo for a 3.33 axle and a 2.94 actual gear but the VSS (vehicle speed sensor) is supposed to be fixed at 4000 pulses per mile reguardless of ratio (sensor driven by output shaft ?).
I may be experiencing incorrect speed readings as well, and I'm not on the original tranny job (previous owner did it).
I cruise just around 2000rpm when it reads 100km/h. All the more reason to check my RPO codes and figure out what my car really came with stock.