I would verify TDC with a piston stop, because of that's off, you'll never get any of it right. It's so easy to do, I would get it out of the way and then move on.
Alright, sounds good! I'm just worried I'll screw it in to tight, and scar a piston? Or not a very good reading. I guess I could screw it in slow, and slowly turn the engine, while adjusting the stop. I'll have to read up on it.......