Drivers SIGNAL not working

What have you checked?
OMG man.... I feel like we've checked everything! Haha. I have not checked the signal switch because obviously that's a pain in the *** but I'm betting that's it. The grounds are good. The bulbs are good. We almost think that some wires are crossed. We have power at the passenger ground wire. Drivers is the the one that's not working. I cleaned the hazzard switch as it was pretty ugly looking but we tested it and it's in working order. Flashers are fine. Weird thing is that when I took all the fuses out, we still had headlights. Also the top left wire on the firewall plug should be ground and it's got power. The Tach is also flickering when the car is running and the tach needle clicks with the passenger signal. So fu*ked up.