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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 Where_do_you_connect_a_tach_on_a_1994_e350or 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 is white with a small pink stripe and is usually tagged as "CTO".

It is the Controlled Tachometer Output. A filtered circuit reducing interference from the other systems giving you a truer tachometer reading.

Most tachometer manufacturers use a Where_do_you_connect_a_tach_on_a_1994_e350wire for their TACH INPUT. Connect the green lead to the CTO wire.

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Q: How do you install an after market tachometer in a 99 ford e350?
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