Need help finding new temperature gauge

OK, so your power device is one of those things with a battery inside? That should be fine

Still not clear to me what's wrong..............

Be certain the battery neg is connected to the cluster ground

Be certain the battery pos is connected to the proper pin going to the VR

Start with no resistor anywhere

Neither gauge should move.

Now connect one end of the resistor to the cluster ground.

First connect the remaining end of the resistor to one gauge, and then the other.

Both gauges should do exactly the same thing................

No resistor...........remain on cold/ empty

Resistor in place.......eventually 1/2 scale exactly.

You might want to measure your resistor to be certain it's 25 ohms. They can be mis--packaged!!!

Below is how to wire it in case you messed up

12V is where you should connect battery, and should be the same point as where the condenser / capacitor wire is connected

GND is battery neg, and also where you hook one end of the resistor

R is where you hook the remaining end of the resistor, one at a time,