What Are All the Gauges in a Semi Truck?

Semi trucks have a number of gauges that help the driver monitor the performance of the truck. Each gauge is designed to measure a different aspect of truck performance, such as fuel levels, oil pressure, and temperature. Understanding what each gauge is indicating can help drivers make sure their truck is running properly and safely.

Fuel Gauge – The fuel gauge measures the amount of fuel in the truck’s tank. It’s important for drivers to monitor this gauge because a sudden drop in fuel levels can indicate a leak or some other issue that needs to be addressed. Drivers should also make sure they keep their tanks topped up as running out of fuel can cause serious damage to their engines.

Oil Pressure Gauge – The oil pressure gauge indicates how much pressure is being generated by the oil pump in order to provide lubrication for the engine components. Low oil pressure can be an indication that there is an issue with the engine, so it’s important for drivers to keep an eye on this gauge and address any potential issues quickly.

Temperature Gauge – The temperature gauge measures how hot the engine is getting as it runs, which can be an indication of potential problems. If the temperature gets too high, it could lead to engine damage if not addressed quickly. Drivers should monitor this gauge and make sure they don’t continue driving if they see that it’s getting too hot.

Ammeter – The ammeter measures how much electrical current is being used by components such as lights, AC systems, and other accessories in the vehicle. This helps drivers ensure that all electrical systems are working properly and efficiently.


In conclusion, semi trucks have a number of gauges that help drivers measure different aspects of performance such as fuel levels, oil pressure and temperature. Understanding what each one does will help drivers ensure their trucks are running properly and safely at all times.

Photo of author

James Gardner