Sounds like a wonderful car. Hope you have lots of fun once you have fitted the wing liners.
No exhaust fumes detected in our 4/4.
Was there a recent post (KEVFITZ ?) mentioning a GPS speedometer? May prove to be the easiest fix. I use the speed readout in my Sat-Nav a lot - still off to the side but closer than the speedo.
I bought the TM recommended one, it sits on top of the transmission tunnel, works well & is nice and bright with numerals about 20mm high, it also has a HUD function but not tried this yet, as I suspect a Mog 'screen will receive too much light on the inside to work well
It's great for helping you hold a steady 30mph in built up areas, as the 3.7 speedo is difficult to read accurately at the angle you view it from