Can someone tell me what size drill bit and tap to use to install the EGT probe? Them guyes at banks don't want to help unless u purchase w/ them.. Thanks....

If it is a 1/4 NPT bung, it should be a 7/16 drill bit, and then a 1/4 NPT tap. Go slowly and don't be too aggressive with the tap...you only need to tap far enough for the probe to reach the center of the exhaust way in the manifold.

Go to thier site and click on products at the top and on that page on the right hand side they have all the manuals there.