Thank you Tom.
Your conclusion to mentally recalibrate your speed reading is probably the best option now.
As Nozzi( contributed above) said , the sat nav/phone(if you use them) GPS reading is accurate and we checked it out at the time and you will get speed warnings, but depending on your eyesight may not be the safest way unless you can readily pick that figure out.
I am sure that I read on the ‘Out and About Live’ Forum a couple of years ago that on a reply on a thread not related to our specific part that Fiat have stopped supplying original spares for our era of base vehicles, but not to worry as pattern parts and used spares are readily available. On other threads regarding the myriad of problems with more recent X250/X290 instrument clusters there are companies that specialise in repairs to them, when Fiat get difficult. So there are options, but I will leave that info search until we have a specific requirement.
Regarding the water tank…Well done to you and Marley (hardy souls) for tackling these difficult jobs at this time of year . The Exsis is a unique rarity and within the limited range of Hymer agents, there are probably few that have experience going back to our era. The seized drain valve definitely is/has been a common problem and many members will benefit from the valuable contribution from Marley and hopefully from you Tom, especially now that he has got into the mysterious lower part of the valve.
I am still getting over my debilitating bout of ‘Flu & severe chest infection’ so am unable to go out and explore under the van at the moment.
Fred