Congratulations on the new purchase.
Dear its simple, first get few things done and than comes the turn of add ons.
1- Throttle body clean
2- Catcon clean
3- Plugs clean
4-Air, AC and Oil filter change
5- Oil change (Always stick with 5w-30 fully synthetic oil - Total 9000 or Kixx G1 are good options)
6- Alignment
7- Balancing
8- ECU reset by removing -ve terminal of battery for 10 mins
9-24 hours wait with normal usage for idle learn process
Once all these are done than observe and share if eco issue persists
regarding meter, if u find orignal its plug and play.
regarding steering controls your multimedia needs to get connected with wires from steering so its a work of learned electrician
Enjoy. its a very nice car.
Will serve you will IN SHA ALLAH
drive safe