Autometer EGT probe different size than a Greddy?

[Jamesnutt]

Hello, I got a engine a lil while ago and been installing it. I bougt a Autometer EGT. Well, after I got the engine I noticed it was already tapped for a EGT but the probe size is smaller. What I'm wondering is if the Automter probe sense it's american is BIGGER than a japanese EGT probe and if all forein EGT probes are the same size. I really don't wanna retap this thing and if I can just buy let's say a Greddy EGT and fits right in then I'd rather do that.

Thanx,
Mike