rpm tach install in a 90 dx

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where can i find the wire to connect the green wire with tells the tach its rpm.on a honda civic dx90
 
If you pull the gauge cluster look for a solid blue wire that goes into the big plug on the left. Or the solid blue wire coming of the dizzy.
 
That wire is still there. I have a DX but switched to an Si cluster, all I did was pull the DX cluster and put the Si right in.
 
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