Dakota Digital Universal Tachometer Interface SGI-8 SGI8 Designed to allow a factory tachometer to function accurately after performing an engine swap to an engine with a different number of cylinders or tach signal. With adjustability up to 16x, the SGI-8 is capable of recalibrating tachometer signals for nearly any engine swap combination. All setup, calibration and diagnostic functions are handled with the use of a built-in 3-digit display and integrated pushbutton switches. Unit measures 4" x 2" x 1" and is designed to be mounted inside a vehicle. Product not compatible with '86-91 VW Vanagon's and other similar models