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There are a couple of different damper designs used on the speedometer but they can be refilled is exactly the same way. The tachometer may have a different design that has a aluminium cap at the needle end but again can be refilled as Ash described. Where the speedo is concerned the mileage counter needs to be removed by carefully bending back the tabs that securing it to the mechanism frame. Whatever is used to seal the hole in the damper needs to be minimal otherwise it will touch the mileage counter as there is only a couple of millimetres clearance between them. No problem with the tacho of course. None of these have anything that could be described as a seal and leakage usually only take place if the gauges are stored face down.
Hello Ash.Thanks for your prompt response. But there is no tube or upturned cup.There is only what appears to be a solid cylindrical slug of steel which the needle shaft runs through. They are fixed together.This is a ND F1 speedo.