Dual Fuel Senders - Shared Fuel Gauge Circuit Help
Use a relay to switch between the senders. However, the resistance values between the two fuel senders may not be the same, so you may need to tweak the signal from the LPG level sender to match the petrol level sender. If the resistances match (full/empty resistances are the same for both sensors), you can use this circuit.







simulate this circuit &ndash; Schematic created using CircuitLab