How do you do it if your crank pulley doesn't have a 'nick' in it to show the timing light what the timing is?

 

I'm talking about for the automatic as well as the manual trannied cars. I notice on the automatic XT6s, the Flexplate only goes up to about 28 degrees advanced. I think the crank pulley timing marks can go higher so this is what I need to use. Can I mark the crank pulley with some type of magic marker so the timing light will pick up on it?

yep. i've used a white paint pen for that.