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Using some LED's, some zener diodes, some resistors, and an analog voltage source you can make an LED bar graph. You could have 5-8 LED's in a line and assign each to 1,000 RPM's. A little Knight Rider feel to your car I suppose...
Keep in mind this won't be an easy project. Merely getting at tachometer behind the dash is a hassle in most cars. Then you have the whole issue of mounting the LED's and building the circuitboard. Of course, firstly you have to figure out what kind of signaling technique is being used before you can figure out how to convert it.
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