Holley's EFI Crankshaft Signal Sensor generates the RPM input signal an ECU needs when running a ferrous-target crank trigger setup. As a Hall Effect sensor, it outputs a digital square-wave signal ideal for most electronic fuel injection systems, and it can also serve as an auxiliary speed input.
Specifications:
- Sensor Type: Hall Effect
- Thread Size: M12x1
- Target Type: Ferrous metal (does not detect flying magnets)
- Operating Voltage: 8-20V
- Length: Approx. 2"
- Mounting hardware and mating connector included
- Part Number: 554-124
Use this sensor only with trigger wheels that have ferrous steel targets or teeth; it will not detect a flying-magnet target.
FAQ
What target type does this crank sensor require?
It's built for ferrous steel targets or teeth on a trigger wheel and does not detect flying-magnet targets.
Can it be used as anything other than a crank sensor?
Yes, it can also function as an auxiliary speed input, such as for a driveshaft.
Is mounting hardware included?
Yes, mounting hardware and a mating connector are both included.
What voltage range does it need?
It operates from 8-20 volts.

