I posted this problem before, and I had good suggestion. I tried them, but they havent worked for the car. I sanded down all ground posts to have good connections, and all ground including thermostat grounds are solid. only when I put the blinkers on the gauges act wild. Wehn I am under 30 mph, the gauges act normal with the blinker on, but as I increase speed, and the gauges act more wildly. any suggests?