96 sport 1.8Liter ?
does your heater work?, You didnt say, very important !
or is your issue mustly the gauge flopping around.
your mech , doesnt have a OBD2 scan tool?
which can tell you the coolant temperature in real time?
( 5 mins work)
some cars, this era, have 2 therm sensor 1st for ECU, 2nd for gauge
I believe yours is 2 sensors. (my prints confirm this)
One sensor is ECU other is gauge, lets ignore the guage, its role is not important to operation.
(some countries and cars this year,are different ! where are you?what country)
On many 96' Kicks , you have 2 sensors
ECU connects to the sensor mounted to the rightside
of the Thermostat housing.
You mech, should have a IR thermo gun that he simply measures the coolant out let housing and can tell you the temperature.
He would then compare the IR gun to the OBD2 reading life
and be able to make a diagnosis.
if readings on either are wrong (guage and OBD2 sensor) then
STAT was put in up side down or the air was not properly burped out of the engine block.
A simple $2 ohm meter can test the sensor, in place at cold and hot. The FSM tells this mech, how to do all that I said.
I think, there is air in your system.
based on crazy guage and it didnt do it before.
Keep in mind that the ECU temperature sensor is very important.
And your engine must come up to full temperature 190 F, +- tad
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