install dome light
 

i have a lancer sportback RA. i want to install a dome lamp with moving lights above the rear view mirror. i thought of either splicing the rear dome light wires and connecting them togetherso the middle lightturns onwith rear light when the door opens and moving lights i can turn on and off when i need. can this be doneand whats the best fuse to use once its connected?

thanks in advance!