1990 240sx notworking:speeometer, speakers, radio, gasgauge and backlight

[Paulz240]

well the title explains it all but the speedomerter doesnt work, neither does the gas gauge and gas light, the RPMs DO work and so does the door light etc. the front speakers doenst work and the driver side back speaker doenst work. the passenger side back does however. also my radio dosent work when i hook it up with the adapters. i hooked it straigt up to the battery and i can hear out of the passenger side back speaker and thats it. And my passenger sid rear blinker doesnt work. im thinking the radio and the gauges are all inter connected? am i right? maybe there is something umplugged. idk y my speedometer isnt workin, b/c my RPMs are so it cant be that box thing near the transmission could it? please help and i am 16 and so car stupid its not funny so please use terms a 6 year old can understand. thanx

[180fan]

Have you checked the speed sensor to see if that's working? It's located on the back of the transmission. The floater could also be off thus leaving you without an accurate gas gauge. Did you also try replacing the bulb on the instrument cluster?

Have you checked for continuity from the decks wiring to the front speakers? Otherwise I have a feeling it's in the way it's being wired. Is the deck powering on at all otherwise or only when it's powered directly by the battery?

The passenger side rear blinker, did you try replacing the bulb?

[Paulz240]

well i forgot to mention that the speedometer would come on after a while and so would the backlight. my radio only works when hooked directly to the battery. and if thet gas gauge is stuck at the bottom, it would read empty (which it does) but the gas light thing would be on and its not. i think for the gauge and the power to mr radio might be all similar because they are both "attached" or at least in the same wire cluster, and both deal with power outages. the speakers ill look into