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Fuel logic system

Here's a basic fuel system that can be ported to a vehicle.
This version has separated "gas" for a normal driving and a nitro boost (although they both refill by the same sensor).

To set it up:

Move all the logic blocks + pistons to your vehicle.
The piston with a yellow armor plate can be deleted, it is just an example of how to make an fuelmeter.
Black logic blocks are the inputs.
Respect the distance of the piston and their position to the sensors (for those who doesnt know it: only one half of the sensor detects things, so the part that is not covered by the pistons can be covered by anything without negatively affecting the build).
The red and green logic blocks next to the seat have to be linked to the main propulsion method (only the green one if it's a thruster or gimbal).
REMEMBER to delete the new seat's controls on those propulsion blocks and the pistons.
The purple block is the boost propulsion method input, so link it to the engine your going to use as a nitro.
The pink block is the fuel gauge, try to make sure that it is covered like it is, so the fuel doesnt get filled by error when falling to a side.
The piston on the yellow sensor has x2 the speed at which the gas will consume, you can modify it.
The piston on the orange sensor has x2 the speed at which the nitro will consume.
If you dont want the nitro, you can delete the orange sensor+piston and the 3 logic blocks next to them (purple, orange and the blue ORgate).

NOTE: I'll post a simple car with the system in-built as an example.