[quattrorunner]

Mine is on with ignition. My turbo is ball-bearing but I have a oil catch tank under it. I've run the tank dry...or at least had ignition on without engine running and have never had trouble. My pump is similar to the cx racing unit so not expensive by mocal or stock standards but works with my single turbo. BB turbos don't have as much to pump though. Now my new water pump for the intercooler is wired with the oil scavenge pump together with ignition on based on that success.