While working on my test harness I was following the wiring diagrams I got from here. I was wiring up a 7727 and when I went to test it, check engine light would do its thing and fuel pump relay would cycle, and I would get spark from the coil when I spun the distributor, but injectors would not fire and fuel pump relay was not coming on. Its like I was not getting a signal to the ecm that it was running. (I did not have my laptop hooked up at that time though)
So I start checking my wiring and found that the pinout in this attachment is incorrect. (I was using this pinout to wire it up)
http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=437&d=1322074489

Its in the 7727 info thread
http://www.gearhead-efi.com/Fuel-Inj...CM-information

It lists pin C3 as reference signal, and pin D13 as bypass. This is backwards. Pin C3 is bypass and pin D13 is reference.

Wasnt sure where to post this so I put it here.
I swapped the wires and retested. All works, and there appears to be no damage to anything.