Ok so a quick intro on me. I have a 86 3gen civic hatchback and now a 89 crx si.

my problem I have is a electrical problem.

What happens is if i'm over 4k rpms in ANY gear and have my high beams or my LEFT turn signle on while at or over the 4k My dash gos nuts:
My tack starts bouncing all over, My Left not right turn signle will start flickering, The temp gauge gos stright up to the H. and the high beams on or off will flicker too.

I let off the gas to go under 4k or shift to the next gear its fine.

its a all stock si car so there is no after market or funny wireing so i'm not sure what it is.

Any one know what it might be? It gos in to honda on friday the 13th but I dont think they will find anything.

thank for the help.