i've never had this problem with my 99, but recently had to do the same thing to my cousin's 97 GTP. There are 2 little plastic "nipples" that push down on the contacts on the switch. They pretty much all broke off (stupid flimsy design) and I just bent the contacts a little and problem solved.

Feels good to save yourselt money with a little ingenuity eh?

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.