Engine light temp. probe question

[BrandonMag]

Not trusting the factory coolant temperature gauge in my instrument cluster, I've decided I need an aftermarket one.

I'd like to install the probe in the engine overheat temp. probe port (on the back of the driver's side head). I thought I saw the size of this on here a couple of days ago, but didn't write it down and now I can't find it.

 

[Trying my best]

http://www.kmart.com/craftsman-9-16-in-easy-to-read-socket-8/p-00950741000P?prdNo=13.

I used this to remove mine. I used PB blaster on it

 

[Agnem]

Most sensors come with a few adapters. I've yet to purchase one that I couldn't just screw in without a trip to the hardware store.