i have a 91 civic std had dpfi converted to mpfi but the wire harness was a mess i found a 90 si hatch in the scrap yard so i took the engine and under dash harness and now when i turn on my head lights to drive at night i lose the whole dash no lights no warning stuff my temp and fuel gauges peg to the top and the lights on the turn sigs stay lite up. any ideas ive checked the grounds everything seems ok im stumped.

 

Sounds liike a ground and 12v are mixed up