Thanks Phil! It sounds like you are the man to talk with.
Now after dragging her home and parking inside a warm shop I am trying to figure this out. Of course I pulled the connector on the control box without reading the warning first in order to test for power there. I'll worry about that if I get power to the dash and the signals working. As of now, I doubt my work on the vacuum line has anything to do with this.

I replaced the ignition switch. What a nightmare they made that with slotted screws! No effect. How in the world did they decide the power for the dash lights had to go through a relay? It looks like that may be the problem, even though the factory diagram does not show it connected that way. I will need a younger set of hands to help test the wiring to the ignition switch. I have a neighbor who is a mechanical genius and he is certified on Volvo trucks. He is coming over later with relays and is optimistic that it will be simple.

This car has a fuel pump relay above the driver's feet and it doesn't click. A spare relay acted the same.

There is another relay in the center of the dash and it doesn't click either. I haven't looked under the glove box yet. You may hear from me again, but if I get it running I will report that here.
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Bob, old retired electrical power engineer (not electronics), living off grid and using good old lead acid batteries that are now 99% recycled. (Just an inconvenient truth.)