Temp Gauge Doesn't Work - Temperature Sensor?

[msantana79]

I have a 72 Chevy C10 that the PO installed a Chevy 305 sb from a 1984 Camaro (or other F-body car). I gave it a good tune up and it runs well now, but the temperature gauge doesn't work. I looked at the engine block, below the exhaust manifold on the driver's side and it looks like there is a sensor there, but it's not connected to anything. Just need to know if connecting a cable from the dash panel would fix this and if so, what type of cable I need to get? I can post pics if necessary.
Thanks in advance for your help.