I currently put a efi setup on a new crate motor and dropped it in my 93 1500. Trying to get my 4l60e to shift (stuck in second) I hooked up the tach wire from old coil wire to new hei distributor thinking that was the problem but I read that a guy also switched his ckp signal wire to read off the tach as well and fixed the no shift (limp mode) problem. But my current problem is I can’t find the ckp wires/plug. Note: I don’t want to spend the $800 on the efi wiring harness for the transmission to run off the efi, if I don’t have to. Any help would be greatly appreciated.