He might not play with computers, but he sure likes gadgets! Any idea what the tap below the oil pressure gauge is all about?

An old friend of mine had a Jag Mk X with a similar problem:

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As for Hoot, he wound down his business life. His garage at Benalla long gone, he completed his tour of duty as a cinema operator at the Wangaratta and Albury Drive Ins. It was my privilege to watch "Crocodile Dundee" one night at Wangaratta, talking over old times in the projection room. I was also fortunate enough to enjoy a breakfast with the old couple in their final home just a few years ago, and be shown the gadgetry that blossomed on his Jaguar Mk X - airspeed indicator ex-NG RAAF, auto starter equipment from a 1928 Studebaker, altimeter et al - it was a toy for a gentleman who mixed his interests in a totally irresponsible manner. Just for the love of it.