This tach input conditioner eliminates jittery tach signals when using points/tach pin B5 to feed RPM data to Holley's 7 in. Standalone Digital Dash.
Specifications:
- Category: Body
- Product Type: EFI Part
- Application: Points/Tach Pin B5 for RPM, 7 in. Standalone Digital Dash
- Connectors: Pin connectors with unterminated wires
- Part Number: 554-131
Designed only for tach input signals (square wave). Do not connect it to a coil negative input, and never connect it directly to any coil.
FAQ
What does the 554-131 tach input conditioner do?
It stabilizes noisy or jittery tach signals when using points/tach pin B5 to provide RPM data to the 7 in. Standalone Digital Dash.
Can this be connected directly to a coil?
No — it's designed only for tach input (square wave) signals and should never be connected directly to a coil or coil negative input.
What connectors does it use?
Pin connectors with unterminated wires.

