Need the coolant eng temp control gauge wiring diagram for a 1994 2.5L jeep

Check engine light on ? The coolant temp sensor is a input to the PCM - engine computer ! All wires come from an go to the PCM . What type of problem are you having ? Maybe able to save you some aggravation an time chasing gremlins . Coolant gauge not working ?
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the powertrain control module (PCM) or the engine control module (ECM). The IPC receives a serial data message from the PCM/ECM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 100°F (38°C) if there is a malfunction in the engine coolant temperature sensor or the IPC detects a loss of serial data communication with the PCM/ECM.

But if you insist ,you can find free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine ! Under system click on engine ,then under subsystem click on fuel controls . Click the search button then the blue link. The second an third diagrams both show coolant temp sensors . Both go to the PCM .

trapped air. When temp needle climbs to 1/4 way, loosen coolant temp sensor to bleed off trapped air in cylinder heads. Air is gone once coolant starts to stream out, but only open slightly at a time. May have to do in increments as trapped air will cause rapid overheat

double posted, back up one page, i posted the fsm pages.
the full fsm for 93 is online, free.
maybe correct.
if not, use alldata.com log in read.

Do you have access to an ohmmeter? If so, can you read resistance to ground on the input wire of your DISCONNECTED temp. gauge?

Possible bad sending unit or shorted sending unit wiring.

try topping it up when cold ,sounds like a air lock

Stuck thermostat maybe?????

Assuming the t-stat is good, I'd look at the wiring next. Make sure the connector is clipped onto the water temp sensor/back of the gauge and that the wiring is not chaffed, etc. If that all looks good, replace the coolant temp sensor...they're $20 or so. If it still does it, the gauge is bad.

Hook up a manifold gauge (mechanical temporary use gauge, used by mechanics) and test the oil pressure. You probably need to replace the gauge. The computer sends info through a printed circuit board behind gauge cluster and sometimes you have to replace the whole gauge cluster.

If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.  The coolant temp "sensor" is an input to the ECM for your fuel injection system. The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases.