Description Solo 2 DL the Solo with ECU connection More than 1,000 protocols for 1,000+ ECU in the database for easily connect your Solo 2 DL to your Engine Control Unit and get a lot of information with just one cable. In case your ECU protocol is not in the database, no problem an ECU Driver Builder is always available in the Race Studio 3 configuration software, and you will be able to create your protocol by yourself. Coil RPM input Solo 2 DL now features a digital input allowing to log RPM either from square wave signals (8-50 V signal) or pulse signals (150-450 V ignition coil trigger – primary circuit).