If yours is the mechanical bulb and tube temp gauge, it is a one piece affair. Flackmaster might have something or you will have to repair that one by buying a universal gauge and soldering its new charged bulb and tube onto the old gauge or send the entire gauge assy to a repair facility to have it done.
Here is a thread with the address of one recommended repair shop and
here is a decent write up from a Plymouth guy on how to repair the mechanical type if you want to try it.
If a different car from your signature and is electric then one of the vendors would be the best option for getting the proper sender since their characteristics varied over the years and models.
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