I just purchased an EGT gauge by omori and I am going to be installing it soon. My question is about the tap needed to install the bung into the manifold. I read one write up by BigSky WRX on this forum where he used a 1/8" BSPT tap while installing the same Omori gauge that I'm getting. I read another persons install, which was an Autometer gauge, where he used a 1/8" NPT tap. I have access to a machine shop and the owner of that shop will do the drilling and tapping for me, he said he only has NPT taps, and he isn't familiar with BSPT taps. My question is, is there a big difference in the two taps and will the instructions for the gauge tell me which tap to use. My boost gauge from Omori has terrible instructions. If need be, I will buy the right tap, but I would rather not if it isn't a big deal.