Theres supposed to be some sort of 'magnetic tooth' on the RS1600i flywheel that triggers the sensor, which is positioned in a specially machined hole on the underside of the bell housing on the RSi box. to be honest ive never seen it on my own flywheel

Its supposed to run over the sensor and trigger the sensor, which in turn sends signals to the ECU to indicate the engine speed

im not sure whether the crank trigger kit would work, but you could give it a try