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I saw an article , or actually a reader submission, in a German classic car magazine. Remember, the gauges are VDO, made in Germany. It showed how one could solder in a small piece of tubing into the line near the sender, and maybe another one up by the gauge itself. The idea was that you submerged the sender end into a jar of ether(?), and using a syringe, you drew the "juice" up through the capillary tube until it was full. Then you crimped , or soldered off the two little tubes to seal the system. As I said, I only read the reference once, a long time ago, so you are on your own if you want to attempt this. Sounds pretty scary to me, even if it does sound do-able. I imagine that professional instrument shops have a safe set-up to do this, but that would havve to be on a large scale basis. OK, Kids, don't try this at home,...