thread sizes
OK, this is only a preliminary report. I have done a little looking for the thread size for injectors, and have come up with two different responses. Which means that I will have to pull one off one of my trucks and report the truth tomorrow or Monday. The two sizes given were:7/8-14 or 24mm-2-6g. The metric size makes no sense at all, probably someone reading the wrong info for the pitch.
The glow plugs I do know are metric threads. M10-1. That is very close to 3/8 inch, but not.