None of the dash is working properly. speedo doesn't move. taco is working overtime. fuel gauge constantly changing. the electronic display for everythind is gibberish.

Question edited for clarity and spelling.
Question moved to model category.

Try this

https://www.volusiariders.com/threads/speedometer-and-digital-display-not-working.348737/

More here

https://www.google.com/search?q=2007+Suzuki+Boulevard+C50+Motor+Cycle.+speedo%2C+fuel+gauge%2C+and+neutral+light+not+working

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connection on the back of the dash needs cleaning if you push on the dash and it all works then this is the fault. sometimes hitting it works just fine for awhile but not to hard.

check for an earth wire or connection in the harness that has the earth wire and make sure that it is attached to the body

Likely, it's the sender unit in the tank. To check wiring and your dash gauge, you can pull apart the connector at the fuel tank, find the wire for the gauge sender unit (its color coded-I dont kinow what the one for your car would be), and on the harness side(the one going to front of vehicle) use a jumper wire and ground that wire to the car frame(get me? you want to ground the wire going to your dash gauge)-with key on, your gauge working properly will move up to half-way or even full. That tells you your dash gauge is working and your wiring to gauge is good. If gauge doesn't move when grounded(double check for a good ground), then your dash gauge may be bad.

Probably a break inside wiring loom of one/more of the three wires that eventually connect to the speed sensor on top of gearbox. The break I fixed in my 2003 Leon 1.6SX was in the loom under battery tray. My symptoms were no speedo working, and erratic fuel guage (particulary when under 1/2 full). I repaired one broken wire.
Jim Nichol
Seat leon 2003 problem with speedo not working and fuel gauge faulty is...

Could be 3 thing - the gauge on the dash, the wiring or the fuel level indicator in the tank. All three are not easily accessible - the best test would be to measure the voltage on the level sensor on the tank.

It usually means removing the fuel tank and start measuring. If its ok, supply voltage to the lead towards the fuel gauge. If the gauge doesn't move it's wiring or the fuel gauge itself.

Hi tcjones65 !

Did you find any solution? I have the same problem on my XV1600. I've changed the speedometer assembly, but it still the same, fuel gauge and speedometer doesn't work...

the dash control board is the controler for the boards in the dash, fuel temp etc. inside the dash itself, a board on the rev counter controls voltage to feed the the fuel gauge etc. the back of the speedo burnt,there is the 3 pin voltage control chip on the board. you can replace the boards. you can remove them from another dash and place them into yours but if you say the board burnt out on the speedo . then i would just change the dash as it would be easier as you would need to replace the speedo as well. you will also need to inform dvla that the speedo has been changed as for mots its recorded. or have the speedo rectified to the right mileage. not informing dvla can affect your insurance.

try to check yor meter conection at the rear of your meter.there is a loose connection due to vibration

Behind the dash is what they call a constant voltage regulator. It controls the guages. It's small and located behind the dash near speedo.