I have seen this before with worn speedo drives (if mechanical or electro-mechanical) and/or worn gearbox bearings which can produce spurious results.
Easy to diagnose by removing any mechanical speedo drive from the gearbox and examining it for wear
Looks like they'll do the job...I have some on my Honda CRV and it makes a tremendous difference to how much it reduces the wind and rain coming in when at speed
Try this link
https://www.ebay.co.uk/itm/CLIMAIR-Car-Wind-Deflectors-JAGUAR-XF-2008-onwards-FRONT/380473771480?fits=Car+Make%3AJaguar|Model%3AXF&hash=item58960105d8:g:DwYAAOxyJU1SNCnN:rk:2:pf:1&frcectupt=true
Wow! some absolute beauties there...difficult to keep the wallet in the pocket event by the look of it 🙂
Thanks for sharing this with us, always great to see classic Jags, and other marques on display.
Hi Rod
Your engine is equipped with a Timing Chain (see image below for layout) and it is worth noting that failure is usually a result of poor lubrication (e.g. infrequent oil changes and incorrect/cheap oil).