Bring my 73 dart swinger back to life.

sireland67 said

You were told how to do correctly, you just did not listen.

With the set up you now have you will not read correct engine temp unless the thermostat is open.
What if the thermostat sticks closed? You will have no idea if the car is overheating.
Maybe drill a couple of 1/8" holes in the thermostat to ensure there is at least some flow thru the engine.

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I have for the past twenty plus years. Drilled four 1/8" holes in my thermostats. I still have the stock temperature gauge. Who knows what it will read. These new aftermarket gauges will read a lot better than that old piece of crap. So what if the new sending unit is 10* cooler then in the head. Dodge puts theirs in the intake water jacket too. I haven't seen or had a thermostat stick in 30 years. If that was to happen. All it would take is tapping it with the handle of a screw driver.