Look down at the balancer (front of the crank, behind the pulley, all the way at the bottom of the engine) from the passenger side, and you will (should) see a metal pointer. Aim the timing gun at that. Depending on the condition of your balancer you should be able to read the timing then. It can be a little tricky if your balancer is really rusty, so finding zero manually and marking it with a paint pen might be necessary.