Ok in my crx there is a major problem with the wiring I kinda don't want to go into major details because it's really stupid what the people before me did to the wiring .. But in reality can I use a 89 crx si underdash harness and plug n play in my 90 crx si ?

 

My experience with the 89 and 90 civic hatchbacks is that some of the connectors are different between the years. Good Luck.

 

Thanks I'll need it