Yes, but if the pwoer supply has 10 to 20 amps or so, flickering/shaking under load isnt going to be a problem, especially if the power going to the CRT sweep circuitry is filtered through an external filter as i mentioned before. Ill give it a shot once I find a suitably sized power supply. the tiny ones I have at work only have 0.1A on the -12v which is too low. So i cant use them, I would say if the filter is good enough, any EMI spikes that occur on the digital side isnt going to get into the sweep circuitry, and vice-versa.

And since I am partnered with a Car audio shop, getting filters for testing isnt going to be an issue.

Yes, those are the types of filters I mean from the automotive world. They are pi-filters. at least should be.

The biggest problem for me right now is time. I am strapped of it. I have been doing a major R&D project for a display corporation on new scoreboard technology, and thats been taking up nearly all of my time, even on weekends to get the hardware design and programming done.