I am looking to make a bar run the length of my windshield with ~100 LEDs going from 50 green, 25 yellow, 25 red. I need to get the signal off of the MSD box and was thinking of turning on 10 leds at a time per 1000 RPM up to 10,000 (we turn 9,600 to 9,800 occasionally). Would this be able to be done with a F-V converter and relays? If so which F-V? I was thinking just put resistors on the input of the relay so as the voltage got higer from the F-V, it would turn the next relay on therefore turning on 10 leds until it gets to the end. Would this work? I would like to do this the most simple way possible without using and micro's or anything if its possible. I have taken some electrical courses in college so I'm not completely lost. Just looking for some advice, Thanks.