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 35869 Technical Specifications:

• Application: 1974 Pontiac Firebird.
• Dash Mounted Tachometer; With 1975-up H.E.I. Distributor.
• Correct wire colors and factory style terminals for straightforward circuit tracing.
• Sold individually.