Hi, to everyone!!
About the fuel level gauge, I used a resistor between the pin 1 - 3 of black connector;
470 ohm = 100%,
235 ohm (470 x 2 parallel) = 50%,
156 ohm (400 x 3 parallel) = 25%,
or you can easily use a 1Kohm linear potentiometer.
To set the temp level gauge around 50%, you can connect between the pin 17 - 18 of blu connector, a 750 ohm (1.5kohm x 2 parallel) or a 10Khm linea potentiomenter.