There is one way around this. You could adopt car repair as your new hobby and benefit from the almost unlimited technical help available on these enthusiast forums. In other words, become an enthusiast yourself, because in this case, your wife has chosen to love a car that is easy for the home mechanic to love -- and there aren't many of them made since.

You certainly don't need the whole car re-wired. You just need to investigate what your last mechanic did and what her mistakes were. Often, folks think instrument panels of different years are interchangeable, when they are not; and just as often, those same people plug in wires they find dangling behind them, thinking they must have forgotten they pulled them off. Simple, easy-to-make errors, that can have wide-ranging effect.

We can guide you through this if you make the commitment to try.
--
Art Benstein near Baltimore

What engineers say and what they mean by it:
"This project has low maintenance requirements."
We wouldn't let the technicians change a light bulb, much less fool around with our baby.