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I've got mine installed on the top radiator hose, which is drivers side on my vehicle. Not sure if it's the right spot, but my temps are reliably between 77-82c depending on weather/load/conditions. About right for my thermostat. It's a mechanical gauge for what it's worth. Think it was a $25 speco meter jobby. Tested it in a boiling pot before fitting and read 100c at boiling so is close enough for me.