HKS DB Meter I/F unit Brand HKS (Japan) Website HKS-Power.co.jp Part number 44008-AK011 HKS boost meter, Exhaust temp. meter and I/F unit The HKS DB Meter I/F (interface) unit is a hub where up to six sensors connect to the meter harness. It's mounted in the engine bay so only one data cable enters the interior and allows the meters to be 'daisy chained' together for an easier, cleaner installation. Related links Modifications - Interior HKS DB Meter RS Boost HKS DB Meter RS Exhaust temp.