End Fence-Alignment Hassle with Rear Measuring Tape
First, buy a suitable length of an adhesive-backed tape measure. Secure the tape measure to the rear fence rail so that it reads the exact same measurement at the right-hand miter slot as the measurement scale on the front of the fence. Then, set your saw blade parallel to the miter slot by following the instructions in your tablesaw owner's manual. Whenever you position the fence, just make sure that the face of the fence bar aligns with the same measurements on the front and back rails before locking.
—Scott Geurin, San Clemente, Calif.