My temp gauge is not getting above 130 i have changed both sensors and checked the wiring is it possible that the new tstat is bad

Check the power to the cluster with your multimeter. You may find a broken wire within the loom.

Check the wires going to the instrument cluster, and check the wires from the sending unit. Possibly a corroded or damaged wire/connector

possible and an accredited radiator shop will be able to do a flow test to check that
unfortunately , it indicates a gasket or cracked problem so have a compression test done to eliminate that
if that test proves good then have the thermostat removed and checked/replaced if the engine runs a viscous fan hub then check that as well
viscous fan hub failure is most noticeable when stopped at lights ( temp gauge goes up but comes back down when moving along the road) temp rises in slow moving traffic , using high engine rpm as in up hill or any condition where the air is not moving through the radiator unless the vehicle has speed
if you have electric fans then the problem may be in the coolant SENSOR unit that sends the temp to the ECM to switch on the fans

Could be a bad tstat or a loose wire inside dash good way to separate tstat problem is to turn on heat if it only blows cool to warm air the you have a stat problem if not I would check fuses that control dash little more info would help diagnose bettrt

From what I just read about your vehicle,it has a history problem with the gauge,may be the coolant temperature sender or the gauge,it says the whole cluster will have to be changed to be fixed if the gauge is bad,found some forums and all had gauge problems.Right above the coolant temperature sensor is the coolant temperature sender,this is what sends the temperature to your gauge,the sensor sends a signal to the computer,they may have replaced the wrong one,here's a link to the sensor,the hole above it is where the sender goes,it's a one prong part,the sensor is a 2 prong part.A lot of people don't know that there are 2 types of coolant temperature gauge sending unit and sensor.

it could very well be a bad gauge. when it shows the engine to be overheated or at the least very hot, check the actual temp at the water outlet where the upper radiator hose attaches to the engine. use a non contact thermometer to check the temp so as not to get burned in the process. if the thermometer reads way different than the gauge, the gauge is bad.

If the truck were newer (1996+) it would have OBDll functionality ... then if the sensor went out ... odds are you would get a check engine light also ... since the signal not only goes to the gauge but to the computer.
I do not know of any easy tests without removing parts.
However .... there may be a chance that it is neither the gauge or sensor but a stuck open thermostat which prevents the engine from heating up ... maybe even after 5 minutes.
There are some things to check the thermostat under cold engine conditions without having to remove parts:

Helpful?
Good luck on your troubleshooting!

Fan operates when coolant temp reaches 226 deg.F and shuts off at 219eg.F
fan is controlled by the PCM infuts from Eng. coolent temp. sensor & Intake air temp. sensor
the yellow wire is the 5V reference and the black wire the is the PCM ground sensor
make sure your not using teflon tape on the threads of the temp sensor.
it sounds like the PCM wont turn it on. check the harness for continuity between temp. sensor and PCM harness
clear connecter - pin 17 black, pin 31 yellow

replace coolant sensor connector?if so can u get a thermo lazer gun to check the block temp? this will tell u if the gauge is incorect,,,go ahead a bleed all the air out of cooling system and see if that does the trick

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.