67-72 Electric speedo

[dayj1]

Originally Posted by DM72C20

Just checking in if anyone has this swap working with a Gen IV engine? I've got an 09 4.8 going into my 72 C20 and was contemplating this gauge swap, but saw that it might not work. Thanks from social distancing in Toronto.

If your setup uses an e38 ECM, VSS out is pin 57 on connector 1. By default, it’ll be 128k PPM (originally went to the antilock brake controller), but it can be changed to 4K PPM in the tune. The 4k signal will work fine with the S10 speedometer.