Any idea what is a dangerous engine temperature for 1978 Mercedes 450SL you are doing some cruising this weekend and your gauge creeping over 175F?

For a 1978 Mercedes 450SL, the normal operating temperature range is between 80°C (176°F) and 90°C (194°F). If your gauge is creeping over 175°F (79°C), it is recommended to take the following actions:

1. Pull over to the side of the road safely. Turn off the engine and allow it to cool down for a few minutes.

2. Check the coolant level. If the coolant level is low, add coolant to the reservoir.

3. Inspect the radiator and hoses for leaks. If there are any leaks, have them repaired as soon as possible.

4. Check the thermostat. If the thermostat is stuck closed, it will prevent the coolant from circulating properly and cause the engine to overheat.

5. Have the water pump inspected. If the water pump is not working properly, it will not be able to circulate the coolant properly and cause the engine to overheat.

If you are still experiencing overheating problems after taking these steps, it is important to have the vehicle inspected by a qualified mechanic.