With this economy? How?
With the 1st regiment of the Arjun already in service? And 248 on order.
With the vast majority of their T-80UD's, except for the final regiment, being of vintage quality (don't believe that shit they tell ya on wikipedia, only the final regiment had welded "T84" turret) - the first regiment infact being from a batch of 52 UD's salvaged from Ukraine army stocks built several years before; and the rest largely made from parts salvaged from other operating countries because Russia refused to supply Ukraine with critical components needed in the making of the tank? With a substandard night vision system, the TO1-KO1E- dependent on the TPN-4E image intensification sight- stabilised only in 1 axis for line-of-sight and with no IR lights mounted on the chassis (most of their tanks don't include the Burran-Catherine-E ), an outdated FCS- with no active cancellation and a Sight/Range-finder with an internal unit for gun-sight system aligning control that takes upto a minute (to check and adjust the correspondence of the central sight mark with the range-finder beam); and the 1G46 day sight- stabilized for two-axes and line-of-sight (Pakisthan has not received the 3 axes stabilization system on the T-84)?
The only tanks worth considering in the Pakistanie inventory are the Al Khalid / "MBT 2000", ~280 of which are in service with the Pakistani Army as of 2010, the ~240 serviceable T-85II AP- which is a potent system because of its 125mm smooth bore gun, despite its fixed shaft transmission; and the Al Khalid II- purported to be in the early stages of development.
They may keep their ~400 Type 69-II's, their ~400 Al Zarrar's and their ~400 T-59's "in storage", but these are lil more than rotting, hulking heaps, that will provide limited use in wartime operability.