Temp gauge not moving

[Woodie]

My temp gauge has apparently quit as it stays at 160 cold or hot car on or off.  Does that mean it is probably developed a leak in the bulb contents? Or is there also an electrical component to it - bad ground for instance.  Gauge doesn’t move in either direction.

[DJK]

Did you try tapping on the gauge? The needle may be stuck.

[Sniper]

Other than the light bulb there is no electrical component to the temperature gauge.

[TodFitch]

Stuck at a non-cold position implies a problem within the dash portion of the mechanism. If the suggestion by @DJK does not work then I’d try a close examination of the mechanism. Maybe some debris fell into the works and is jamming it. If nothing appears to be amiss then you may be looking for a whole new assembly.

[Marcel Backs]

If it is a mechanical gauge, it most possibly sprung a leak in the tube, hemorrhaging the ether whose expansion with temperature moves the pointer on the movement. Try carefully removing sender from engine  and applying heat to it with a heat gun. If still no movement the gauge is toast requiring the sender to be re filled (new tube and charged sender) or replacing it with a NOS part which should still be available. Both options run about 200 USD plus the now expensive shipping cost. Hope this helps M