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It is the blue wire off of the dizzy that you want to hook into... .hook that to the pulse wire on the tach. and then there is usually a power a ground and a wire to illuminate it by running it to your dash lights. .

I was running an autometer pro comp 5 inch in my old rex and the difference between that and the stock tach was about 200 RPM's. .

T0x1c
 
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