An embodiment provides a method for mounting a telematics device within a vehicle that has an on-board diagnostic unit for collecting diagnostic data. The telematics device may be coupled to an original on-board diagnostic connector mounted in an accessible location within the vehicle to enable a diagnostic scan tool. The diagnostic scan tool may have a connector which is unique to the type of vehicle. The method may comprise: 1) mounting the telematics unit within the vehicle such that it may be hidden from view; 2) coupling an electrical cable to the telematics unit; 3) removing the original on-board diagnostic connector from the accessible location in which it was mounted; 4) coupling the electrical cable to the original on-board diagnostic connector; 5) coupling another diagnostic connector capable of mating with the scan tool to the electrical cable; and 6) mounting the diagnostic connector in the accessible location.