I think I have a real problem here and need a more knowledgeable opinion. I have a 70 coupe with a Ford racing 306 motor. I recently rewired the car with the American Autowire kit and I have New Vintage Usa aftermarket gauges. My problem is, I never felt the temperature gauge on the NVU gauge was reading correctly so I bought a new autometer temperature gauge. My problem now is... the New Vintage gauge is reading my temperature as being about 190 but the autometer gauge that I have that's brand-new is tell me that my motor is running at 210. How can I find out which ones accurate?