The 360 build that has more turns than Willow Springs

That looks clean.
I'll get something that sits flush like an oil gallery plug. As to the temperature sending unit....It is used so I don't know if it works. In fact, The gauge in the car doesn't work either. With a new build, I'd like to get it working with the engine that is in the car now.
I thought the test was to turn the key ON and pull the wire from the sending unit. If the wire gets grounded, the gauge needle should peg to the right, correct?