no need for tester, undo partially the outlet banjo on the pump and turn the pump by hand untill you see fluid there that's VERY important, then tighten it back and start the engine, if it's primed you'll see the fluid circulating in the tank, if it's steady undo the bolt again asnd insist...when the fluid is well circulating in the tank go for a harsh ride with lots of cornering at as high speed as you can to be safe... top up te fluid after every mile...it will bleed itself this way... check the level periodically untill it's steady cos it might take a while depends on how much the ACE will activate the rear actuator... go to some surface where flexing is involved that will help things...just make sure the fluid is always circulating in the tank tjat's the most important otherwise you can kill the pump...this pump priming thing is compulsory even if you use the tester but the tester will do exacly what the system does when it works in the field if you see what i mean