Hi,
Normally Ambassador Tyre Disk will be bit harder and tougher. Even that has taken a heavy impact somewhere i believe. As i told earlier, Oil Pump Gauge will come down if the engine is in Idle, but if you see at the meter while driving in an Average speed, it should work normal above 3.
Since you were saying its 2 and below that, Surely Oil Pump need to be checked. But give it to a mechanic who know about that. If Pump is not working upto the mark, pickup of the car will not been up to the mark. It may be very slow to pick up the Speed.
Before giving it to work ask him about the Charges (Money).