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Hi every one

I have been reading a few of the how-to's on how to install a tachometer in my focus however a lot of the instructions are saying i would require the Ford racing tach driver but my question is if my car already has a factory tach would i still require the tach driver or would there already be one in the car. I am guessing if it already has one it would be controlled by the ECU. Any how any help on this would be great.
 
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