The OTC 3050E is a proven test device to quickly determine if the electrical signal is present at the fuel injector. Just plug in and turn over the engine; flashing noid indicates good signal. Expanded set of eight Noid Lites cover: GM PFI, Ford TBI, Geo TBI, Bosch PFI, GM TBI, GM SCPI, and now new applications of Bosch 2 and Multec 2. This kit comes in molded plastic case and includes a harness extension that allows for convenient remote viewing from the driver's seat.