SWM does not use voltage from the receiver but from a power injector instead. This means that a lot of signal meters will not work with this particular lnb. The advantage of a signal meter is to fine tune a satellite and a signal meter will register signals that a satellite receiver will not.
If your skew (tilt) is on the correct setting and your pole/mast is plumb then the readings from all the satellites should be pretty similar, 80s and above. If you need to use a signal meter to find the signal at all then you can put a phase 3 lnb on the dish, fine tune it with meter, then connect the coax from the SWM lnb directly to the receiver and facing the reflector move dish slightly to the right (move dish slightly to the left if behind the dish where the adjustment bolts are).