Haven't driven my '74 hardly any at night until saturday. Everytime I stepped on the brake pedal, the lights would flash/blink once. From normal to dim back to normal. Just a split second flash. The ammeter needle didn't budge. My tach is also acting up. At idle or driving, the needle bouncing. At idle 800rpm, the needle goes up to around 2500 and back down. Driving at 2500rpm, it will go up to 5000. Associated or 2 seperate issues?