[Christ]

Damn dude..

Speedo problems are VSS usually... replace it w/ a known good one, and if that fixes the problem, you're good... if not, then you need to check that wiring too...

The problem w/ theft recovery is that you can never really tell exactly what was messed with.

The interior lights coming on is probably related to the Cig lighter not working... does the clock work? they all tend to be on the same circuit... if the clock comes on, but doesn't read the right time, and always says 1:00 when you start the car, it's the wiring on the courtesy circuit.