Regardless of the issue the engine has to come apart. Head off minimum then see if it something in the head.
Or ignore the results and get it running and see what happens. If it has sat Un-running for a while it may come good, but that is wishful thinking.
If it is pretty easy to get running just do that. Why was it comp checked? Most of the time you are better off not knowing!
There are 2 temp sensors. One for ecu, one for gauge.
By " all the info " you mean coolant temp and revs right?
Ask yourself this. Can you see the oil pressure or fuel level on the ecu?