i have a 5" monster tach and a v-afc. both were working fine all yesterday and today. then tonight when i turn on my lights, the light in my tach and boost gauge don't work and my tach is not reading my rpm's. my v-afc is not reading my rpm's either. my tach does work with my lights off. i didn't have a chance to check anything because it was dark. but, i will first thing tomorrow. any suggestions would be appreciated.