That's a tough one to diagnose over the web. First hook and ammeter to the battery and measure the draw. Then pull one fuse at a time and look for the draw to drop off. Could be your cluster. the SI board has been know to cause weird problems. You may be over your head on this and have to call on an expert. You may be surprised how quickly some well versed with your model can find the problem. I would also do some learning about electrics. Likely to be some great resources on the web.