Q: Temperature gauge acts errratically and engine destroyed

The temperature gauge in my vehicle has begun to act erratically. After taking it to the dealership, I was told this is a common problem among my make/model, but he didn’t tell me what they would do to fix it. Later I found out they replaced the gauge and a leaking hose at a whopping price tag! Three weeks after that the temperature gauge began acting erratically again, so I immediately took it back to the dealer. This time they diagnosed it as massive overheating; the head gasket slipped and all coolant and fluid drained into the engine. The engine was totally destroyed and could not be repaired. Once again I was told that this is a common problem with vehicles of my make/model. Before I spend multiple thousands on a new engine, could you please give me your suggestions and any advice? Thank you.