Lower the planer to the lowest depth stop on the machine.
Remove the pointer screws and the pointer on the existing manual scale on the planer. Use a screwdriver to do this.
Position the digital readout against the planer frame scale approximately 8 to 10 inches above the surface of the planer's table.
Use a level to adjust the readout so that it is completely level and then mark the top straight edge of the readout on the mounting surface with a pencil.
Remove the backing of the foam tape on the back of the digital readout and then mount it using the marks made earlier for straightness.