440 Rev Lights and Tach Problem

I have a 2006 440 rev and the lights haven't worked for a few weeks then all of a sudden came back on tonight, which who knows how long they while stay on. Also, the tachometer always stops and resets. Then the engine check and overheating lights are always on even though there is no signs of overheating. The sled runs great. Already switched the voltage regulator and bulbs for the lights and that didn't do anything. Obviously something electrical and I've heard other things like the relay and stator but I don't know where those are located. Any help is appreciated thank you.

440 Rev Lights and Tach Problem