Note you should always use suitable shielded cable for crank and camshaft sensor wiring, with the shield earthed at ONE end only (usually the ECU end).


A crank sensor is critical for the ECU to maintain correct engine angle tracking - issues here can lead to misfires, non-starting and even engine damage, so always ensure you carry out any testing needed to rule out crank sensor faults if an issue presents itself.


There are typically two types of sensor on the market, VR (or variable reluctance) and Hall.

VR type sensors do not require power, and instead, generate an AC voltage as metal teeth on the crank pulley/flywheel casting fly past it, whereas Hall sensors require a power supply, and output a DC square wave based on whether a tooth is currently under the sensor, or not.


2 Wire Inductive (un-powered) VR Sensors should be wired to VR Crank/VR Cam inputs +/- connections, 


3 Wire Hall Effect (powered) sensors should be wired to VR+ for the signal and use a pull-up on the signal line of the Hall sensor (a 4K7 resistor to 5V REF usually suffices) and connect this to VR+. Leave VR- unconnected in this case.



Be careful to route the wiring away from any sources of electrical noise such as starter motor, alternator or the HT ignition system.


The guide on setting up triggering, and more info specifically on trigger wheels, can be found here.