Hey, needing some help/ideas as I am stumped. I'm doing a Carb to TBI swap with the 7427 PCM. I thought I tested everything before I installed it into the vehicle but I can not get a map reading in tunerpro. All of my other sensors work and I checked the wires, I do get ground and 5v, but when i apply 5v or ground to the signal wire I get no change on the reading. And when it was all plugged up with the Carb still, i got no reading... don't know where to look next. I also tried another working PCM, same thing.