New Poster Has A Few Questions

[The Mad Signtist]

Hi I'm a new poster but I've been viewing this forum for a few months since I bought my daughter a 79 auto 240d. Bought it for $550 and drove it home (top speed 45mph) Then I set to work: New master cylinder and front brake pads, glow plugs, valve adjustment, rebuilt injectors with new nozzles, hand primer pump, diesel purge w/ new filters, oil change new filter, trans. filter change new fluid,water pump, front window regulators, alternator etc etc.
So a lot of time and considerable money so far but it's also been a fun new hobby and pretty easy to work on.

So my questions are:
1) The car now won't shut off and I think I've isolated it to the manifold or whatever behind the ignition switch. When I disconnect the one going to the shutoff valve and hook it up to my mityvac and pump it up the car shuts off. So can anyone confirm this part as the culprit or should I continue to look for small leaks that might be starving the vacuum system. I checked the vacuum line at the brake booster and I'm getting about 22Hg.

2) I just did the trans. fluid change with new gasket and filter. I got the correct fluid but not quite enough. Can I top it off with dexron III or similar or should I order more of the expensive stuff

Thanks for you responses