Coolant temp sensor quit working.

[z_ya]

Alright guys, I left work and the car was already warmed up (1978 280Z) the temp was about a quarter of the way to half way on the gauge. I stepped into it and then when I got off of it the temp gauge suddenly shot down and stayed there. I pulled over checked the wires and everything seems to still be connected and in tact. Any ideas to what has happened? Thanks in advance guys.

[bartsscooterservice]

sender unit gave way, or corrosion at the connector, bad connection, i think