timing problems

hey i just recently installed a new GT2540R turbo and i took out my crank angle sensor it was in the way of puttin the turbo and manifold in and now my timing is all messed up i have a timing light but is there any marks and the crank angle sensor itself to line up cause i keep having to take it out and rotate it and keep playin with it so the bolt holes will line up

and also with spark plus is for cylender one for when i use my timing light and what timing mark should i line the timing peg up with theres like 10 marks lol

thanx
dan