temp gauge problem...

We are in the final stages of my LsVtec build. At the moment we are having a problem with the temp sensor. When the ignition is turned to the "on" position the temp gauge buries itself to the H, even when the motor has been sitting overnight and is obviously cold.
I was told that this could temp sensor problem could also be why Vtec wont engage.
Please help me out....Im at my wick's end with this car(at least for a while)
 
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