Fitting to run mechanical temperature gauge and dash light?

[Too Many Projects]

Originally Posted by PeteLeathersac

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A Block Coolant Drain Plug removed may offer a nicely out of sight location for whichever fitting is easier to adapt?

The hole size is much smaller and a reducer bushing would need to be used, and I don't think the bushing would be deep enough for the electric sender.

I was just out looking at my 409, Jake, and the only other possibility I saw would be a T at the intake for the 5/8" heater hose for the electric sender. Seems to be room around that area for this, but I only have a single carb, so no reference for clearance to the 2x4.
Dorman does have a straight neck cover. I have one similar on my '38 for the fan controller.
https://www.summitracing.com/parts/rnb-902-2046