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i want to install an aftermarket tach but at the same time make the stock one still run i read the diy but do not know how to make both tachs work at the same time if someone could please give me detailed instructions on how to do it would be appreciated and if you have pics that would be awesome and where did you run the wires down in the dash thanks

 
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can someone please help me with this i know this may sound like a stupid question to most of you but like i said i have never done anything with guages id appreciate the help

 
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just connect it to the blue wire on the ecu. they will still both work,

 
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just strip the wire...dont cut it.

 
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thanks for the help guys that all i needed to know