How do you set timing for a mack injector pump?

first of all ,you will need an A/B light ,you can purchase one from kent Moore tools ,then you will bar the engine over until you see the 1 and 6 six marks on the fly wheel at the bottom of the bell housing . If you have and older e6 model there will be apionter at the harmonic balancer at the front of the engine ,bar the engine until both indictor lights come on on the a/b light then you be able to see what the timing is set at