I think that little fitting is soldered on. Can you use a straight
brass union to connect the tubing?
That clear, flexible plastic tubing for boost/vacuum gauges might
work, too. I'm not sure what the working pressure is on it but if
you look into it you will probably find it adequate.
Something similar to Jeg's offerings might work:
http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&catalogId=10002&langId=-1&Ntk=all&Jnar=0&Ne=1%2B2%2B3%2B13%2B1147708&searchTerm=gauge+tubing+kit
You would just have to adapt the end to the Spridget end.
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