I was trying to replace the switch on the.

I was trying to replace the switch on the transfer-case I got from a local parts store. The light worked opposite from what it should, showing engaged when off and off when in four wheel drive. I hooked up one of the the one of the connections ( I should have seen the hand writing on the wall when I had change the connection to fit the new switch) to the back up light switch on the side of the transmission. Now none of the gauges work, except that the battery light stays on all the time. What happened and what do I check to fix this mess?