Here is what I have '85 K20 Burb with a newly transplanted 454, got it running today. Temp Gauge is showing at the line between 210 & 260. Replaced the sending unit and got the same thing. The gauge does rise and fall but is just high. If my notes I have are correct the following ohm values correspond to the temp. 210* - 185 ohms 160* - 450 100* - 1800 I put the ohm meter on the sending unit and am reading between 220 and 240 ohms. I am running a 180* thermostat. Anyone with experience? I want to use the stock gauges cuz that is what I like. It was working prior to the engine change. Thoughts?