The functionality of three devices in one 4” x 2” x 1” case! The SGI-100BT can adjust/split/recalibrate an electronic speed signal, calibrate a tach signal, and aid in the creation and adjustment of a gas tach signal for diesel swap applications! Speed calibration from 25% - 400% Multiple speed outputs available for multiple devices. Electronic pull-up built in; high or low voltage input. Tachometer settings from 1-16 cylinders and 5V or 12V signal type. Diesel applications: outputs for 4, 6 or 8 cylinder tachs. Can read off flywheel sensor (available separately), timing gear sensor or alternator W-terminal (stator tap). Bluetooth technology syncs unit to available mobile app for programming and setup. Built-in programming buttons and LED display for setup in lieu of app. Not for use with ABS sensors or systems.