Need help troubleshooting an overheating indication. Does anyone know what the correct temperature sender resistance range is supposed to be to work with a stock temperature gauge? I suspect I might have the wrong sender unit installed in my restored engine but have no specs to follow. I found a 25 kOhm resistor wired to the temperature gauge but do not see this in any of the wiring diagrams, but when I remove it indicates even hotter (full scale hot). My 1958 Chevy Apache 3100 has its stock 235 engine which was recently restored but it shows that it runs hot whenever I stop at a couple of traffic lights or let idle for any length of time, runs in the middle of the indicator range whenever I'm moving. I have added a shroud, checked the thermostat and water pump and correct coolant levels, all checks good. Also, it does not port anti-freeze, so I am not sure I am actually overheating. Any tips, data or suggestions would be greatly appreciated.