The Lc1 and LC2 use different sensors, so be aware of that, I forget the nomenclature, but it is clear when you start looking as the plugs are different.
If it works and gives a reading then it will be fine, I've certainly had one in a box for 5 years and it worked fine on first switch on, just remember to calibrate it in free air.
Well, it is a quattro.... Don't think I haven't though about building a 5 cylinder turbo independent suspension buggy...
FWIW it had hydro boost from factory, but too expensive to fix when it went wrong, so runs a normal servo now.
14.18 at the battery is fine, there will be voltage drop between the alternator and battery so you won't see the full 14.5V
Other cars have a straight 14V regulator, and charge fine.
Looks like one of these:
https://www.lrbits.co.uk/drivelodge-lifting-pop-top-roof-defender-110
However, if I were doing a lifting roof it would have to have the bed in it.
Of course, being in the states, and access to cheap LSs autoboxes and numerous different transfer cases, and the vehicle being a long wheelbase, I wouldn't be putting anything LR based in it.