Go through my post for having user screen areas in Equipment and F/Locns: ITOB0001, ITOB0003 : User-Fields in Equipment, Functional Location, Fleet Masters
and you can add these screen areas to any tabs as explained in this document. If you wan to have them in a separate tab then, take Tab 0060, 0100, 0105 Additional data tabs to the Standard view profile of Equipment and have these custom fields there.
KJogeswaraRao