S500 Conversion W220

Hi! Soon an S500 W220 Bj 99 will be at my door. I plan a large-scale (and perhaps somewhat nonsense-sounding) conversion with the car. I would have some questions about this. 1. Autogas Does the consumption indicator remain on car gas while operating, or does it fail? 2. Navi Evtl could come to a command from the facelift. The question is: does it work in the old W220, and can it be connected to the driver information display? 3. Chassis Can you lower the S, Is it possible to set the automatic box, i.e. the part where the gear lever is, a little higher (c.a. 8cm)? That is, how is the box connected to the transmission part? Through a flexible wire (like a bicycle brake) or with a fixed rod? Many questions, I know, but I would be happy to get an answer. Your V28