Unfortunately, I do not write programs and codes, but I have a son who understands what needs to be done).
Maybe there are ready-made solutions or programs that can help. Maybe this device?...

Congratulations. The question is, is it possible to write code to extract the tachometer data (rpm) from the J1850 VPW standard and convert it to the ALDL 8192 protocol.
Since I did a 1988 Buick...

I found a project on the forum that should solve my problem. But he does it with the help of Arduino and takes the signal from the ICM. I did so used his code. But for some reason the indicator is...

Congratulations. The question is, is it possible to write code to extract the tachometer data (rpm) from the J1850 VPW standard and convert it to the ALDL 8192 protocol.
Since I did a 1988 Buick...