left turn signal..dead!!!

My right turn signals(Front and back),blink,but they blink either fast,slow,or it will blink once and then stay on,and neither of my left (front or rear) work..and the back parking lights and reverse signals work,but when you press the brake,they don't get brighter...and one more thing (i think is related to that prob.),when u press the brake the gas guage shoots up to full.(even if your sitting still)...i have searched ALMOST everything over and spent almost 150.00 on little things i thought would fix it...nothing worked so yall pull through and give me some answers....PLEASE!!!!!