Suzuki Club UK

hi im a new boy to the club and in need of help i have bent, broken, snapped and replaced most of my sj over the years but just recently alot of electric bits have stopped working mainly on the speedo panal on tracing the wires back thinking i might have a short or somthing i found a metal box behind the glove box which was full of water this i thought cant be good can anyone tell me what this box is i need to replace it ASAP because nothing works at all now IE:- horn panal lights rev counter speedo gagues although the car runs well all lights and things work it is somewhat of a problem.

Does it look like this
What year is it, some of the the early ones also had this unit