I have a 1996 Harris-Kayot Ultima 2000 deckboat with Merc 5.7 V8 Alpha I drive. The glass on the tachometer got broken (kids?!) and I've been looking to replace it. Seems difficult to find a tach that matches the rest of the instruments, so I'm asking how hard it is to switch them all out? I've only been a boater 1 year and a mechanical novice. Is it just a matter of pulling the old out and plugging the new in? How are those things secured in there anyway?<br /><br />Thanks for any help. I know some will say it's silly to replace them all, but having one gauge different from the rest will drive the OCD side of me a little nuts!