Welcome aboard.
Neither the odometer or speedometer are accurate on the Hawk. Most of us on here have upgraded the a digital cluster. Myself I bought mine from mjstef, a member on the forum that sells them. It's very accurate. There's also a few other option too. This thread has a some information on a couple.
http://www.chinariders.net/showthread.php?t=23089
As far as the fuel gauge, you will probably need to pull the tank and make sure the sending unit is plugged in all the way.