For tank, can try to go Scrap yard to look for one. Its cheaper. For the meter, depends on which part is damaged. If only the casing, its not ex. If the bracket, its still cheap. Only if the inside piece is damaged, then need to buy whole set. check properly. Go to a more reputable Bike shop. Trust only those. If not, I would guess that you only gotta change the whole set of everything that is damage even if only the exterior is damaged. Unless you know how to see. Anyway, get your fen who knows S4 to take a look for you.
Good luck.
Scrap yard should be open today. 27 Jln Buroh. Boss is Ah Ann. Tel: 96256549.