Blue painters tape from 3M and others is a great alternative to masking tape. This tape is wonderful for holding items in place during the install process. It is clean and leaves no residue, as long as you remove it within a few days and it doesn't get a lot of heat.
Bruce seriously recommends AGAINST leaving this tape in a loco for more a few days (one week?). It will be come hard to remove and leave a nasty residue over time!