BTW, don't let this leak go on for any amount of time. It will send oil eventually throughout your whole vac system, and if left for long enough will eventually contaminate brake booster.
Also, the point about your key not turning is correct. Replace tumbler soon. (although I've been milking mine on the 240 for a few weeks now)
Don't think the line to the oil pressure gauge leaking would cause it to come out of ignition switch area, but it is always a good thing to look at.