Hi Jacques I’m afraid the gauge and tube are integral so you will need to replace. The easiest solution is to buy an electronic temperature gauge ( eBay) and sensor. Most come with 1/8 NPTF threads,so you will need an adapter with a 5/8 UNF male thread and an 1/8 NPTF female thread. You may find a good second hand Volvo gauge and tube from someone on this site if you wish to keep the car 100% original. Good luck.
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