when i turn on my headlights sometimes my tach and temp gauge go all weird for a bit then there fine, after that if i turn on my brights my turn signals come on, on the cluster and the bright gets dim on the cluster, the tach stops working and the temp gauge goes all weird, and for the fuel gauge it goes up and down when ever it wants to. at night when i turn on my brights when cluster goes crazy it will stop for a bit and then do it again.

my headlights never get dim neither do the brights when there on

i have checked all the grounds in the engine bay all good

im confused

 

check grounds under the dash?

 

sounds like grounds to me, like they're grounding each other out (loose).