Parellel to Fence
I would suggest that it is important to have the mitre track parallel to the router fence, so that you can use the two in combination. Since the fence probably has a certain amount of flex in it, this is not critical. If it were me, I would set the fence as square to its slots as possible, then cut the slot for the mitre track parallel to the fence.
Nice mitre guage. I bought one, but it doesn't fit the slot in my table saw, my router table or my bandsaw, so I haven't been able to do a product review. I am going to use it in a home-made table saw I am building (slowly), and might incorporate it into a home-made top for the bandsaw (one day) and then I will be able to comment on its quality. But so far it seems to be a winner and good value for the money.
Please let us know how it goes.
When my time comes, I want to die like my grandfather did - quietly, and in his sleep - not kicking and screaming like the passengers in his car.