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Sounds like you are getting close to the problem.

He said old sensor was clicking off and on too.

If you disconnect the plug from the sensor does the wait light come on and stay on. Sounds like a loose wire or connection somewhere .

Since both coolant sensors are clicking either they are both bad or I suspect you have a problem with the plug to the sensor or the wiring itself. Do the sensors have resistance on a volt meter when cold?

What brand of glow plugs and temp switch on rear driver side temp sender and glow plug relay did you use? You have changed a lot of parts at once making it a little harder to diagnose. I suspect one of the new parts is defective or not the right one or a wire is in the wrong place or moving...