DEFI is back with an all new line up of gauges and controllers. AS always all DEFI gauges feature ultra smooth and accurate metering along with a classy look to match the ultimate in tuner cars. BF, ZD, and CR series feature an all new ADVANCED LINK SYSTEM, meaning the playback, logging, and link functions of the gauges is all taken care of by a base control unit. This new advanced system is not compatible with the old DEFI LINK system so if you are wanting the new DEFI look you will need to buy the new control unit as well. RACER Series gauges do not require a control unit due to their analog design. RACER series gauges do not offer logging and playback either.