RPM Bridge is an interface designed to allow RPM overlay on SmartyCam videos when the car has got no engine control unit (ECU): this can happen with classic cars or particular car categories.
RPM data are obtained with connection to the coil. RPM Bridge can as well be useful to get RPM data when ECU has got no data line CAN/K Line/RS232: in this case data are obtained with connection to the square wave signal coming from that kind of ECU.
RPM Bridge allows visualization but not recording of RPM data.