Dash temperature guage reads 250 but engine is 195 - 200
1993 Chevy k1500 truck 5.7 engine. New water pump, engine thermostat, and radiator flushed. I checked the top of the engine and it runs at 195 - 200 degrees. I also put on a new engine temperature sender unit which is two wire replacing a one wire unit. I suspect it may be that but I don't know what the ohms should be hot or cold.