who here has installed an exhaust temp. guage?

who here has installed an exhaust temp. guage?

I have one. I know that I need to install it in the third exhaust runner. And it needs to be no more than one inch from the exhaust port.

my question is, can I do this myself?

I have cobalt drill bits. Will they be sufficient for drilling in my cast iron manifod?

thanks in advance,

aj