it's kind of like one of those things where you find the differences in the pictures

It's a lovely day outside, you jump in your car to head to town, anxiously awaiting the purr of the engine. You plunge the key into the ignition and delight as the engine roars to life. You check your dashboard make sure you've got fuel and everything is in working in proper order. You smile as your eyes flicker over the dials that look like this:

Lovely! Gas, good to go. RPM's, looking good fella's! Time to hit the road.

What you don't want to see is this:

Gas, we're still pretty good.  RPM's....RPM's? Where are you, you little bastards?!

This is what your gauge is like when it's a dick and can't make up it's mind whether it wants to work consistently or not work at all.  And there is no way in hell I'm paying over 300 bones to fix it when it's not quite broken yet.

I've got my eye on you RPM's, time to shape up!