Are you sure it's a 993 decklid and not a 964? The 993 lid is shorter than the pre-89 ones.
The best way to wire it is using an aftermarket load-sensing circuit, that allows power windows to go up and down with a single touch, instead of having to hold the switch in one direction or the other and count in your head.
Click on this thumbnail for a larger version of the wiring diagram for using a power window switch and a one-touch controller:
And here's a link to the load-sensing unit itself:
http://www.autoloc.com/detail.lasso?itemid=WC1000
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Jack Olsen
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