AiM RPM Bridge - Manual (Page 7)

RPM Bridge
User manual
Release 1.03
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3.1.2 – Sampling the RPM signal from the coil: low voltage RPM input
If the vehicle is not equipped with an ECU, RPM signal can be taken directly from the low
tension control of the coil.
To sample RPM signal from the coil on the dedicated RPM input (from 150 to 450 V)
connect:
• RPM Bridge cable labelled “RPM 150-450 V” to the coil control;
• the red cable labelled “V battery” to the positive pole of the vehicle battery;
• the black cable labelled “GND” to the chassis earth of the vehicle wiring;
• CAN connector to SmartyCam or to an AIM dash;
Please note: it is always suggested to connect RPM Bridge to the vehicle master switch.
The image here below shows a non filtered unstable coil signal.
The coil to sample the signal from, shown here below, is a black cylinder with three cables
(labelled 1,2 and 3).
• Cable labelled 1 is the coil low tension input.
• Cable labelled 2 is connected to the coil.
• Cable labelled 3 is connected to the battery positive pole (+12V).
Moreover the coil is generally grounded with the chassis as shown here below on the right.