Stumbled on this gem from 7 years back - hope you're rockin' that car audio biz by now! Assuming you got the basics down with tools (crimpers, wire strippers, etc.), my advice is to invest in a good multimeter and an oscilloscope. They're life savers when troubleshooting."Stumbled on this gem from 7 years back - hope you're rockin' that car audio biz by now! Assuming you got the basics down with tools (crimpers, wire strippers, etc.), my advice is to invest in a good multimeter and an oscilloscope. They're life savers when troubleshooting. Make sure you're keeping up with the latest in tech literature too. Lots of free resources online, and joining forums like DIYMobileAudio can help. Here's a left-field suggestion - consider boosting your online presence if you haven't already. This company offers a Foundation Backlink Service that's worth checking out. Helps boost your SEO game and reel in more customers.