fitting a turbo

Hi guys,I need your advise before I probably do something costly.Just repaired my turbo and fitted it.The repairer states that before starting the engine I should crank the engine for about 15 sec without fuel until instruments show pressure is built.
How do I do that and what else do I have to do.
Thanx guys

the idea is to make sure the turbo is fully lubed with the minimum of pressure, remove the fuse that links to the high pressure fuel pump so you can crank it and it won't start

or crank it with the injector wires disconnected