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Under the hood, near to the center of the vehicle, behind or just to the right of the air cleaner assembly there are three factory provided (for dealer or optional upgrades) BLUNT ENDED wires. They usually have what appears to be about 1.5 inches of black heat-shrink on them.
One of them, white with a small pink stripe, is usually tagged as "CTO".
It is the Controlled Tachometer Output. which is a filtered circuit not having interference from the other systems giving you a truer reading.
Use caution if you drill to go through the firewall to the passenger compartment with your Tachometer leads either installing a rubber grommet or other insulating material.
Most tachometer manufacturers use a GREEN wire for their TACH INPUT. Connect the green lead to the CTO wire. Use a "clean" HOT wire source, even directly to the battery, and not an accessory hot wire as it may have interference that could corrupt your tachometer readings.
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