I have a 1993 240sx se.Me and my friend put in my cd player from japan. We had it running and power was fine. We went to run new speaker wire to the doors and the blue wire that supplies constant wire just went dead. I ran a new wire to replace it but when that wire quit working so did my speedometer. I check all my fuses and they are fine. my tach lights up and the clock works but the speedometer wont turn on. Can anyone help me?