Autometer gauge help

[8300johndeere]

I bought autometer gauges the three gauges, pyro, tranny, boost and the tranny was easy to hook up. But I am on the boost now and what size tap and drill bit do I need to tap into the 90 degree elbow?

[jesilvas]

Depends on the fitting but I used a 1/8"NPT tapered tap for the 1/8"NPT fitting. I used an 11/32" drill bit. I think it was 11/32" anyway.

[windrunner408]

You need a 1/8" NPT (pipe thread) tap. Look on the tap itself and it will tell you the drill size required. You can usually get the tap and drill bit together.