Salman you can get that meter from Rimpa Plaza in Karachi, there's a large MCB Bank branch on the ground floor just after the pedestrian bridge, there is a huge market in there which is mostly whole sale but most shops will sell individual items at a margin,
there you can get this meter for around 150 t0 200 for the cheap chinese version,
you can also find better quality ones at Hashmis for around 450 to 500, again Chinese but far better in quality which are backlit and get hooked on to your headlights wiring loom.