For 1″ ID Hose
$39.95
KOSO X-2 Boost Gauge with Wideband Air/Fuel Ratio (BA029001)
O2 Adapter, Bosch Wideband Sensor (BG001855)
KOSO Wideband Air/Fuel Ratio Meter (BA004068)
KOSO Water Temp Sensor, Replacement (BF550023)