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Just curious , does anyone have a manuel that tells them what wire is the tach for the wiring harness. Is it oin 22? please let me know
jeff

 
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The gauges work on a multiplex system. That means that there is a sender in the ECM and it is read at the gauges. So there is no clear cut connection for a tach. There is a wire listed on page 22-56 which lists a test tachometer connection. It is listed as A13 (blue wire on Connector A (blue one). I hope this helps, but this is one of those areas that you should be really careful with, one wrong connection and you damage your ECU or gauge cluster. And I am pretty sure that the warranty does not cover this. Good luck.

Plus the DIY talks about the test connector location behind the battery, this might be an easier location to grab it.

 
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there's a little black box, on the passenger side behind the battery. its your tach terminal. hope that helps.

 
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So speed racer, my wire is blue with grey specks every once in a while that is next to the battery. so all your saying is to splice into that wire and run it to a tach ?