Ignition reset for cluster gages my temp gauge sticks at 180° so at normal temp it shows way high...

GM vehicles From 2003 to 2006 had insturment cluster problems , the motors that drive the gauges , (Stepper motors ) Plus you need to know the complexity of the electronic's on your vehicle . There is a serial data communication network that the module's share info.on . GM class 2 serial data buss . The temp. sensor is an input to the PCM - engine computer , the PCM sends this info to the insturment cluster over the data network ,the insturment cluster has a microprocessor with logic programmed inside . All it take's is for one module , in your case ,sounds like the insturment cluster having problems an bring down the data network . This can cause all kind of electrical problems . Even not starting . If you know nothing of automotive electronics your best bet , take it to a qualified repair shop. Without the proper diagnostic tools an service repair info. You probably won't be able to do anything to fix it. Need a professional type scan tool to view data .

012 GM Class II Communications

How to repair GM Instrument Cluster Speedometer Gauge Stepper

047 Engine Hard to Start or No Start Scan Data for Ignition

What diognostics say its a sensor ?????? No diagnostic's ever tell's you it's a sensor . You as a technician would need to prove that by testing electrical circuits , viewing coolant temp sensor . Hooking scan tool and trying to command the gauge with by directional control . The temp gauge not showing any temp. ? No movement ? Engine Coolant Temperature Gage Inaccurate or InoperativeStep Action
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the Lamp and Gauge Check in the IPC Special Functions list.
Does the engine coolant temperature gage move up and down when commanded?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 4
--
4
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Would hate for you to replace the coolant temp sensor an find out that's not the problem ! Does the vehicle start an run good ,trans mission shift good ? If so it's not the coolant temp sensor .
Engine Coolant Temperature Gage
The ECM sends coolant temperature as determined by the coolant temperature sensor to the BCM via CAN serial data. The IPC displays the engine coolant temperature with the gage when the BCM sends a class 2 message to the IPC indicating coolant temperature percentage. The engine coolant temperature gage defaults to cold (0°) or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of CAN communications with the ECM.

NO , there is not a fuse just for those two thing's ! There are two power supply's for the whole insturment cluster . You could need a new cluster or the ECM isn't sending this info. to the cluster . Could have DTC'S - diagnostic trouble codes stored in the PCM or the insturment cluster . Without knowing how this works (insturment cluster gets it's info.) Your best bet , take it to a qualified repair shop that has the knowledge and test equipment to diagnose this problem.
Engine Oil Pressure Gage
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 psi (0 kPa) or below if:
• The ECM detects a malfunction in the engine oil pressure sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
For the 4.2L LL8, the ECM uses an engine oil switch that is open when the oil pressure is normal and closed when the oil pressure is low. At normal pressure, the engine oil pressure gage will display 275 kPa (40 psi). At low pressure, the gage will go to 0 kPa and the low pressure warning will be displayed in the driver information center (DIC). At high pressure, the gage will display 551 kPa (80 psi). Any values between these three values are calculated values determined by the ECM.

Voltmeter
The instrument panel cluster (IPC) displays the vehicle voltage based on the information from the body control module (BCM). The IPC uses the serial data information from the BCM to provide a voltage level indication on the voltmeter.

DTC P0521: Engine Oil Pressure (EOP) Sensor Performance

DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage

Volt Gage Inaccurate or Inoperative
2
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the instrument panel cluster (IPC) gauges output control.
Does the volt gauge move up and down when commanded?

Ok? Do you have a problem with temp gage? Does it work? Are there any applicable trouble codes for the instrument cluster? Some of the national brand auto stores in the US will check codes for free.
With some vehicles, you may be able to get instrument cluster to self-test. Press and hold odometer reset button, turn ignition switch to run, release odometer reset button. Any stored 3-digit code will be displayed in the odometer vf display. The vf display will perform sequential segment test. All indicators, "data controlled" will illuminate. All gages will cycle in 12 or 15 % increments. The cluster internally commands all non-hardwired indicators and gages to operate.
I can only talk in general terms, I don't know if this will work on your particular vehicle?

Check all your fuses make sure they're good. This can also come from bad ignition switch or ignition switch going out

The first thing to do is to get a regular gauge and locate the sender on the engine and pull the sender out and put in the gauge to see what the real pressure is. While the sender is out and you start the car see if the gauge still sticks to the right. If it does then it is the instrument cluster that needs to be fixed. If the gauge reads low with it disconnected, replace the sender. IF the actual test gauge reads high pressure then you have another problem all together.

I'll put my bets on a faulty gage...but that's just me.

Euc? Do you mean ecu, the computer? Don't think so. Something in the cluster, maybe the little voltage regulator on the back of the cluster. But if the engine light is flashing, definitely have it scanned for trouble codes, first, to see why the light is on. The light may indicate a poor link or connection with the cluster.

I'd use a couple of resistors representing full and empty. Take connector loose from fuel level sending unit at gas tank, two wires, use resistor between the proper two wires, turn key just to on, you shouldn't have to start it. If gage reacts properly to both resistors, I believe the problem is the sending unit in the gas tank. If it still doesn't function properly, have to check wiring circuits and instrument cluster. The resistor ohms, 16 ohm--and 158 ohms. These are just generic specs.
Some ford instrument clusters can do a self test. The only problem I have is, I don't which years this applies.
With the engine off, depress and hold the odometer reset button. Turn the key to the run position and hold until the gages sweep, within 5--8 seconds. Depress the reset button once to advance to each stage of the self test. Turn the ignition to the off position to exit self test. This test is w/o outside input, so if all gages sweep except the fuel gage, I suspect the instrument cluster has a problem. I'm not sure if your instrument cluster has the self test ability?

#1 If It's a 2000-2006 GM the stepper motor in the cluster may be the problem.
#2 There may be air in your system. Bleed out the air and the Antifreeze flows a lot better.