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Special oil pressure sending unit socket. You can get it off with a similar sized deep socket. But yes they make a socket to fit the sending units. I have a Snap-On one. you can buy a HF one real cheap. I have mine 35 years and used it less then a dozen times. Good Luck. Be Safe.

Well your post helped me out. I have a brand new tachometer like that in my stash. Don't know if I will ever use it but I have it. So I got that going for me. Does a HMMWV have a cable driven speedometer and are the HMMWV gauges all weather resistant?

Start that one first and leave them all as loose as you can. I still have difficulty doing this installation from time to time also. Good Luck.

Zeus51. When I was younger I had a friend that had a Jeep CJ7 with a 401 in it. He called it 16 gauge. It had 16 gauges in it. It was very cool looking but a mechanical nightmare. I remember it had gauges for both axles ,transfer case, fuel pressure, pyrometers, tilt gauge, every gauge...

I think (I know) they are pipe thread. That will be different. plumbing fittings work as well as brass fittings. Hardware store items. Just take the plug and match it up. Ace the friendly Hardware Place. I always use smaller local businesses instead of big clueless box stores. Be Safe Good Luck.

I always used the coolant passage on the right rear head. I just sourced a left head sensor and removed the sensor install a brass fitting to accept the coolant temperature sensor for the gauge. That thing is real close to the instrument cluster so the manual gauge harness must be pretty short...