There was some noise in black wire. Potential or something. What I did was to cut wiring from sender (green and black) and took those under saddle. So I can play later with unspoiled resistance. It wasnt reading well with started bike. Now it is.

Yeah my electrician friend told me the same Voltage divider. Best for me would be some circuit that can activate 12v leds 3 of them that will signal how much is left in the tank.
I got these http://www.touratech-usa.com/Store/P...ED-Dash-Lights

Sounds like the way to go.

Keep at it. Good to have a project that gives the grey matter a work out! ;)

Electrics v1 done

IMO 100r 50 (wheel speed)
Touratech roadbook motorized
Touratech 5 button control from handlebars (imo+rb)
Trailtech voyager (coolant temperature, rpms, gps speed)
Touratech sport led lights (n light, high beam, left turn, right turn, 3 led indicators to show fuel level, reserve blinks)
http://denali.sigp.eu/rrel/2.JPG
http://denali.sigp.eu/rrel/1.JPG

custom made circuit + sw for measuring variable resistor in sender + waterproof seal, module is under the saddle
http://denali.sigp.eu/rrel/3.JPG
http://denali.sigp.eu/rrel/4.JPG
http://denali.sigp.eu/rrel/5.JPG

Looking good! :023:

Here is a voltage divider tool that may help with your calculations.

http://www.raltron.com/cust/tools/voltage_divider.asp