Several vehicle security systems entail additions, alterations, and modifications to the current factory wiring. For this type of alarm system, you need the help of a professional to do the installation. Also, to make sure that all the connections of the wiring are routed properly, safe, hidden, and clear from corrosion and wear, several system sensors, entail preliminary calibration done by a professional.
This is to make sure the effectiveness and lessen the probability of false alarms. If you are wary of spending additional cash for the professional installation, it is always worth it to have peace of mind knowing that your car has a good security system properly installed.