I have 1994 ford F-150 and i took apart the instrument cluster and now it beeps every time i turn the key?

I made sure i put everything back together rite (using Haynes repair manual)

still dont know why it beeps now.???I have 1994 ford F-150 and i took apart the instrument cluster and now it beeps every time i turn the key?
All cars do that. My cars do. They should stay on as long as your seatbelt isnt buckled, door ajar, or something. Should turn off when you start it up and everything is good, but unless it doesnt turn off when you drive... then i would say live with it.