Brad:
If you are cost conscious, you might think of used parts from a dismantler. Oklahoma Foreign or DC Automotive are examples. New the module is about $500 and the two required tilt sensors for the front and back suspensions are something like $90 a piece. I don't know what the price of the wiring harness is. With a dismantler, you'll pay about half.
As folks have said, the Litronics themselves are plug and play. I don't think the tilt feature is. My understanding is that a new module must be activated so the car recognizes it. If I am correct, you might need a code for the module from the seller so it can be programmed by a dealer or a independent shop. So check with a repair place first to see if the car can accept the module's commands.
The following URL describes generalyl how to install wiring for the tilt feature. It's for a system similar to Porsche's so it will give you a good idea how to do it. You have to sort few a few layers of pages, but it's there.
Installing the New Wiring Harness for Litronics
Good luck
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