... need to drill one hole, easy and efficient;4). Multi signal outputRS232, RS485, Voltage (0 ~ 5V), Current (4 ~ 20mA), ... GP4000, GP6000, GP6000F1.GP4000 support fuel level sensor with analog signal output.2. GP6000 works with digital fuel level sensor (RS232 ... station, oil storage, fuel tank, steamer fuel consumption, generator of petroleum drilling or construction machineries, ect… Each fuel sensor ...