Yeah along the same line, (getting ready for camping season) I just finished adding a set of add on Auto Meter oil pressure, engine temp, and trans temp gauges to the Durango yesterday.
I bought a pillar pod to mount them in, and I don't have a huge wad of leftover copper tube bunched up under the hood like when you mount them under the edge of the dash.
The instructions said that it isn't a good idea to mount the water temp in a tee like I usually do, so I thought I had a better idea but, no. I wanted to screw it into the block drain plug, has a 1/4 NPT plug below the freeze plugs. Well as luck would have it, they moved the block drain on the driver side of a dodge 360 over the years, from in front of the motor mount to behind it.
I pulled the starter to put this in, and when I went to put the starter back I discovered that the big battery terminal lug on the starter just so happens to need that exact space next to the block drain plug. So I wound up putting it in the manifold, had to unscrew one of the heater hose nipples, and add a 3" straight pipe nipple in place of that, then a tee, then the heater hose nipple with the gauge bulb in the side of the tee, I wound up going to menards for some 3/8 pipe fittings to so it. Wanted brass but found out they had the fittings I needed in 304 stainless for about half the price of brass fittings.