It seems the tach question has been covered a lot but I was unable to find any information on creating a tach made of several LED's. I'm building a small dash to be placed on the steering wheel of a racecar. I'd like to use 5-10 LED's to progressively light up as the RPM's increase for a small yet effective tach for the driver. I was wondering how I will light each LED based on the freq of the tach signal. Any assistance or circuit schematics would be greatly appreciated.