A tach install isnt to hard, just power wire goes to a 12 volt switched source such as ignition, ground wire goes to a ground, light wire goes to either the dash lights or just to the same ignition switch, now for the tricky part, the rpm wire. What kind of car is this for? For the shift light I had i just ran it to the rpm wire off my ecu connector. Thats really the only thing you need to worry about finding. Your ecu is usually located on the passengers side under the dash by the glovebox. Hope this helps you at least a little bit.
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