Hi, I'm new to RX7's...I have a 85 gsl and it's been running ok since I got it....but now out of nowhere the Exhaust overheat light is on (buzzer buzzing) and all the gages read nothing (gas, oil pres, colant temp, RPM, Battery) there is also the battery light on and blinkers, hazards won't work.....I thought just letting it sit over night without running would resolve the overheat issue but I still have same issue....please someone tell me it is an easy and cheap fix