My Tech tpi temp gauge reads hotter than it is? What type resistor can I put in on 1994 Dodge Ram 1500

I have put some older resistors in line with it but it makes it stay on 0. Thanks

Asked by for the 1994 Dodge Ram 1500
1 answer
How hot is the truck running? I know you say, that's my problem. Well buy a noncontact thermometer.