Temp. gauge on 2001 Toyota Tacoma

My temp gauge goes to max and stays at start up?

Asked by for the 2001 Toyota Tacoma
Is your coolant boiling over? Temperature gauges that are pegged on hot can be due to a really hot engine, but can be due to a wiring issue or sending unit issue. Obviously if it's hot, don't drive it and have the engine overheating diagnosed. But if not, then looking at the sending unit and wiring would be the next steps.