A tachometer needs a clean signal from the ignition to read accurately, and a spliced feed is a common cause of a needle that wanders. This harness supplies that circuit with correct connectors and wire.

American Autowire 38282 Technical Specifications:

• Application: 1977 Chevrolet Truck.
• V8.
• Correct wire colors and factory style terminals for straightforward circuit tracing.
• Sold individually.