E30 M20 engine oil pressure primed, prior startup 

BMW M20B25 engine,how I prime oil pressure without cranking on my fresh builds.
why I do this ?
to ensure the motor is primed with oil prior to cranking and check oil flow to the cam.
Whilst doing this ,care must be taken not to damage the needle roller support bearing in the block.
disclaimer..
If you intend to copy this method it is at your own risk , please be aware I'm not responsible for any damage ,as I have no control over your level of skill or understanding.
At part 2:50min in the video, extreme care must be taken as the oil driveshaft top needle roller bearing ,situated in the block can be damaged if you aren't careful.I've actually made a special tool that locates in the bearing and the 6mm hex to support these items whilst priming oil pressure.