Erratic Temperature Guage Readings

[Biotex]

Just noticed that the needle on my temperature guage heads for zero when I go around corners or brake or accelerate. I'm figuring it is just a loose connection at the sender, but not possitive. Any other causes?

 

Keeping in mind it drops, not raises. Tat would indicate an open vs. a ground correct?

[HOrnbrod]

First clean the wire connector and the sensor stud (right rear of the cylinder head) and make sure it makes a good tight connection. If okay, pull the wire connector off the temp sensor  and the gauge should deflect to LO (0*). Then short the wire to ground and the gauge should peg to HI. If it does, the wiring is temp gauge wiring should be good, and it's new temp sensor time.