VDO Pressure Sender 400 PSI Floating Ground - 1/8-27NPT 38/8. Pressure Sender 400 PSI Floating Ground - 1/8-27NPT 38/8 Ground: Floating Connection: Knurled Nut Voltage: 6-24V Specifications for VDO Pressure Sender 400 PSI Floating Ground: Manufacturer: VDO Color: Black Package Contents: VDO Pressure Sender 400 PSI Floating Ground VDO 360-406: Pressure Sender 400 PSI Floating Ground - 1/8-27NPT 38/8