Hey guys, i'm in need of some help. my RX-7 wouldn't start one day (even after being jumped) so we clutch started it and took it to my garage. I removed the starter thinking that that was the problem but it worked fine when i took it to autozone. So, I reinstalled it and checked the ground wire (what i believe is the ground wire, it was attached right next to the oil filter) and tightened that down, which seem to fix it. Then one day the tachometer stopped working and the next time i tried to start the car I had the same problem again, and we once again clutch started it and the tachometer started working. THEN, it did the same problem AGAIN and now the tach has stopped working and the car won't turn over. I need some help guys what could the problem be?