1. Faulty gauge. If the gauge itself is faulty, it could be drawing too much current and blowing the fuse. To test this, you can disconnect the gauge from the electrical system and see if the fuse still blows. If it doesn't, then the gauge is likely the culprit.
2. Short circuit. There could be a short circuit in the wiring that is causing the fuse to blow. To find a short circuit, you can use a multimeter to test the continuity of the wires. If you find a wire that has continuity between the positive and negative terminals, then you have found a short circuit.
3. Faulty fuse. It's also possible that the fuse itself is faulty. To test this, you can try replacing the fuse with a new one of the same amperage. If the new fuse also blows, then the problem is not with the fuse.
4. Overloading the fuse. The gauge fuse may be overloaded if too many devices are connected to it. Check the fuse rating and make sure that the total amperage of the devices connected to the fuse does not exceed the fuse rating.
If you are unable to find the cause of the blown gauge fuse, you can take your van to a qualified mechanic for further diagnosis.
