Not real happy with autometer

I have the C2 gauges also but they are mechanical and the big tach. One day the tach starts reading about 3000 rpm high. I call Autometer, they say check that is has the full 12 volts, it does. I call them back they tell me to send it in and they'll check it. Now this tach is about 2 years old by now but has only been in the car about 8 months. Well they fixed it, sent it back to me and never charged me a dime. Not to shabby in my book.