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It won't start, or it won't turn over?

If you replaced with a new ignition switch, my next logical step would be the clutch pedal switch. If it's not working, the car will do everything but turn over. If your replacement ignition switch was used, get a new one. Those things have enough trouble as it is.

I don't think that your gauge cluster and start issues are necessarily related

Edit: you can check the clutch pedal switch fairly easily by simply jumping it's connections.