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!<p> Speed calibration from 25% - 400%<br> Multiple speed outputs available for multiple devices.<br> Electronic pull-up built in; high or low voltage input.<br> Tachometer settings from 1-16 cylinders and 5V or 12V signal type.<br> Diesel applications: outputs for 4, 6 or 8 cylinder tachs.<br> Can read off flywheel sensor (not included, available for purchase separately), timing gear sensor or alternator W-terminal (stator tap).<br> Bluetooth technology syncs unit to available mobile app for programming and setup.<br> Built-in programming buttons and LED display for setup in lieu of app.<br> Not for use with ABS sensors or systems.<p> *Product not compatible with most '86 to current European or '96 to current Jeep tachometers.