Mac,
If your car is track only, a manual Accusump setup should be fine.
Refilling it is just "rev the engine up a little for a minute to get the
oil pressure up to normal, then close the valve." This will fill the unit. You can verify by looking at the Accusump's pressure gauge to see if it reflects your usual
oil pressure.
If you go electric, which is the setup I use, you basically exchange the ball valve for a pressure switch and solenoid valve. The pressure switch determines the minimum opening pressure for refilling the engine from the Accusump.
I use the electric version with a dash switch. It's plenty fast enough for the track. It's just a bit more wiring and parts; mine is a street/track car so the convenience seemed like a good idea at the time!
Tom