When installing these systems with the ECU on the throttle body, best practice is to separate the power related wires to one side of the car and the signal wires to the other side of the car. If wires ever have to cross each other, they should do so at as close to a 90 degree angle as possible.
Taking the time to route and extend these wires as necessary to keep them away from ignition wires and other power wires will typically result in good running without having to add any shielding to any specific wires.
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-Jason
1969 Pontiac Firebird
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