Cam

Hi everyone first time on hear and I need the help. I have a 1999 600 FAZER I use it to commute every day (12 miles each way) Yesterday the speedo,the rev counter the tacho meter all started working intermittently the speedo winding all the way round or siting on zero, however, when I operated the brake lever the gauges jumped al over the place the bike has never exibited this fault before and switching it off and restarting seemed to cure it. The battery was flat a couple of weeks ago but I recharged it satis please help.