These are precut except for a few small holes that are cut after the decal is applied. Simply cut along the outline of the hole with an exacto knife using the edge as a guide. They are adhesive backed, just stick em on. The accurracy shoud not be affected, but you do want to make a note of where your needles are before you remove them. Instructions are included. If you do not want to hassle with the install, I will do it for $75 + postage. I can also put a small tach in that end one. Cost varies on that depending on which tach you want.