Hey Spongebob, on my autometer setup I didn't worry the alternator light. I just ran a voltmeter to monitor the electrical system. When you install the speedo and tach you don't even install the printed circuit board. You end up losing the turn signals and all of the warning lights. I ran "12 Volt built in resistor LED's" from Radio Shack (only $2 a piece) for turn signals and mounted them inside the bezel. You could do the same for the other warning lights or install gauges for those other systems. Those LED's are only a 2 wire hook-up (pos/ground), really simple to install. I also put in a 12 pin (I think) quick disconnect harness so if I ever take the assembly out all I have to do is unplug it. The overall wiring is pretty much straight forward. If you have anymore questions let me know and I can even email you some pictures of my installation. Hope this answers your question.