Hello Diesel Groopies
I am new to the site and need a little help. I recently rebuilt my 6.5 out of my 1996 GMC. I put a lot of time and money in this truck. My problem is that I took it to a mechanic to have him prime the fuel to get it started. That work is done but my problem is he could not time it. His scanner was not matching up with the degrees on the injection pump. If anyone could shed some light in the hole that I am in it would be greatly appreciated.

Ps everything is set. The timing gear is lined up correctly and it was at TDC. It seems the that the computer is not matching up with actual pump.