So what kind of plug should i be looking for to go into the back of the gauge cluster? Is it just for the tach? Also the fuel gauge doesnt work and the gauges dont light up. What could be the problem? Thank you

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If none of the dash lights are working then check for a bad fuse. If just some of the gauge lights are out then there may be some burned out bulbs. You get to them by turning those black bulb sockets. Most of the problems with fuel gauges are due to sensor problems in the tank. I would check that area first.

Do you know what the plug in the back is for? it looks like just a plastic hole. Not sure