weird electrical problems....

I have a 98 plymouth voyager 3.3L. My gauges and radio have to started to flash, flicker and sometimes just go out. The still runs fine the whole time but I cant figure whats going wrong? I changed the battery, ignition switch, key lock and cleaned all connections. It stills starts right up everytime.... but I kinda need to no how much gas I got! any ideas?

I have a 98 plymouth voyager 3.3L. My gauges and radio have to started to flash, flicker and sometimes just go out. The still runs fine the whole time but I cant figure whats going wrong? I changed the battery, ignition switch, key lock and cleaned all connections. It stills starts right up everytime.... but I kinda need to no how much gas I got! any ideas?
I had one with the same problem, it turned out to be two bad solder joints on speedometer board. hope this helps,