ok heres the low down

-Started car one day and speedo wasnt working... ok fine ill drive without it

then i started my car one day and it magically started working which was sick

got in my car this morning and now its not working

wtf is up with my gat dang speedo!!!

 

Sounds like a sensor problems someone had the same problem on this a few days ago try to find it, should be only 2-3 days old so not hard to find it.

 

What year is the teg? You may be looking at a new speedo cable...

 

if its a DA, you may need a new speedo cable as XNXIXTXRXOX said. Though just double check on the transmission, whether the clip is on there and holding the cable in.

If its a DC then you will most likely need a new VSS sensor.