You say your lights for the tach & speedo are out - how about the gas & temp gauges? If those are out as well, it's probably a fuse. If it is light bulbs, you'll have to remove the dash face plate, remove the 4 screws holding the instrument cluster in place, and pull out the cluster far enough to get at the bulbs in the back. This sounds (&looks much more daunting than it actually is - shouldn't take much more than 1/2 hour to take apart & put back in. The bulbs are 194's