Goofy spedometer
 

Hi all,
I've had my 96Z28 for two summer's now and it runs pretty strong, but I'm noticing some things (which might be small) I need to replace a broken rear wheel stud, but that's another topic. (Do I really need to drop the rear and press off the exciter ring?)

But my question tonight is. My wife and I were sitting at a red light and I look down and say "huh, that's new. Apparently we are going 30 mph"
When I let go of the clutch and get moving, the Speedo goes back down and is normal. Sound like a VSS issue?