Can temperature gauge be adjusted?

[saxart]

This past summer I was driving down the road and started hearing a fast ticking noise from somewhere inside the cab. Long story short, it was the temp gauge. The needle was slamming from high to low over and over and over until I pulled over, popped the hood and found that the temp gauge wire had disconnected itself from the sensor and was grounding out on the engine block.

After reconnecting the wire, the gauge now reads very low even when the engine is up to operating temp.



Is there a way to adjust these gauges so it reads at the right spot when the engine is warm, or do I need to replace the original gauge?