The mounting holes on the board are dimensioned for the Davis Passive Radiation Shield, part #7714. If you are not using the Davis shield and did not use the PC board as a template before assembly, the mounting centers are defined by the corners of a rectangle that is 2-3/16" x 2-29/32".
Again, be aware that telephone cables sold at Radio Shack and other outlets are not compatible. Most telco cables flip-flop the leads connected to the modular plugs. The 1-Wire® bus requires a straight-through cable. Crimping tools, modular plugs and cable are readily available at most electronic supply outlets at a reasonable price.
There is no calibration procedure for the sensors. They are calibrated at the time of manufacture and will perform as expected with the software.