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Lasers are the answer. Pair them up with photodiodes and a simple circuit, you can make it play a tone if you're on track. Or you can just line them up so that they're just outside where your mirrors ought to be; if you see the dots, you're off course.
Course, it'd be easier to use some sort of a simple visual indicator, but you seemed to want high-tech.
Bonus points if you rig them so that they turn on when the garage door is open and shut off when it's closed.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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