We take your Factory E30 / E36 / E39 (other models) clusters and install a DM-100 OBD2 gauge where your Factory water temp Gauge currently is. The Combo Includes the Mod to your factory Cluster installing a 52mm screen with obd2 driver a Temp sensor Module and software you can add up to 31 more sensor modules and display up to four sensors at a time including OBD2 functions off your factory ECU.