i am super happy with this RPM Gauge.. works fantastic good and looks also very good ! very nice finish, chrome is very good quality. you can connect it to the + signal from the ignition coil and also to the + signal from the crankshaft trigger RPM and Voltage Display is very accurate !!! , i compared it with the OBD data from the Injection ECU Update Speed of the Display is around 0.5 Seconds i am very very happy with this Product ! Great Deal !!!