You tube is your friend!
Hope this is what you need.
treating the mic (3 wire) as a pickup (2 wire), use pins 1-ground and 2-positive from the mic, ignore the other one (3-negative)
Sounds interesting. I know Jack White had a pull out Bullet Mic in one of his guitars.The bullet most likely a high impedance mic that does not require phantom power.
I think your biggest problem with the mic will be feedback.
Okay I get it now, I thought it was inside the guitar instead of detachable from the guitar. My Bad, carry on.
My understanding is that he wants it wired into the spout of his gas can so he can sing into it and follow the same signal path as his pickups. Paul you are right feedback will be an issue.
How about a Tin Can Mic like CBGitty sells wired through the guitar's controls? It could be hooked up to the can spout for an echo/reverb effect like a Talkbox.