to all wira sifussss..i've asked this question before..but still its a mystery to me

urm..okay..i would wanna know where is a reliable accesory shop to repair/buy new center lamp inside the car..y'know?the one where you open the doors and the light comes on..yeh..that particular lamp....and how much...prefer not those 10bux chapalang ones.. hehehe.. =P
next is the meter panel..i know some wira owners have these problems :
-fuel meter unreliable
you can rely on the meter to show how much fuel left coz its so random..sometimes full..sometimes empty..sometimes it shows "exact" fuel..only have to rely on the petrol light when there's low fuel...
some "diagnosed" the fuel meter to be faulty..some says the float in the tank..some say the wire behind the meter panel...what say you? =P
-temperature meter unreliable
sometimes it works..sometimes it stays down and not show tempreture..
is there any way to repair the all 3 above?and their estimated price?
regarding the meter panel..is it wise to change to a 1.5 above meter panel or just repair it?coz no one know exactly what is the main problem especially the fuel meter..