No, replacing the flasher wont help with instrument lamps. What happened to me was I basically just kept messing around with the wires and cleaning up any connections I could find (including dismantling the fuse block), then suddenly, as I turned the headlights on one day, I noticed my dash lights were on! I have no idea exactly how. However, the connection is a bit fragile, sometimes just tapping the lamp switch will turn off the dash lights. Also, for some reason, one of the back lights in the instrument panel is flashing instead of the actual signal bulb for both hazard flashers and turn signals. So in short, my dashlights probably weren't working because of corroded connections, I reccomend going through them and cleaning them up if you haven't already done so.