Auto installation is a job that involves the installation of car accessories such as stereos and heaters. The term 'auto installation' can be broken down into two crossword solutions: STEREO (6 letters) and HEATER (6 letters). STEREO installation involves the wiring and mounting of audio components in a vehicle, while HEATER installation involves the installation of a heating system in a vehicle. Both of these tasks require knowledge of electrical systems and the ability to work with tools.