You need to target who it is that you are qualified to work for, and where it is that you would like to work. Before you abandon your expertise in the automotive industry, you might examine what other kinds of management positions you're suited for that keep you out of the pits. With your expertise, you should be able to support the mechanics and help them do their jobs better. Everybody loves a boss who will do that. Your challenge is how to persuade someone that you can make the transition.
Job search is a full-time job that requires aggressive networking and diligence.
Find out who, exactly - the specific industry, then the exact companies, and finally the specific manager. If you're good at your work, talking to the relevant people will be easy. You have everything in common with them. Find out what, exactly, are the problems, challenges and opportunities these employers are facing. Find the name of the boss who needs your help and send your materials to him or her.