Pakistani tactical goals will probably be something like the following, in order of importance
1) hold India back on the ground front and prevent them from making significant gains
2) prevent Indian air supremacy and contest any air superiority.
3) take ground in certain sectors at any cost, to force a land trade for the de-suspension of the IWT
My opinion= Pakistan will fight but be totally unable to gain the ground needed to force India to reinstate the IWT. Therefore Pakistan will then try to threaten some other objects/ industry of importance in India in retaliation
(Unlikely to be an Indian dam, as an Indian retaliation on Pakistani dams would be far far worse) this could potentially be collaboration with China in Tibet