Can anyone identify these

[dap1977]

Hello,
 
While doing my shopping list of things I need to do a boost gauge and water temperature gauge. I came across the following when I removed the air box.
 
It looks like a temperature probe has already been inserted into the top radiator hose. Is this the OEM probe for the stock gauge??
 
The only reason I ask is that is looks exactly like the aftermarket one I was looking at( the blue unit) and it is wired in to a OEM looking plug.
 
Hopefully this link will work to the picture!!
 
http://i530.photobucket.com/albums/dd341/dap1977_photo/DSC_00942.jpg

[dap1977]

So after poking around it seems that the sensor in the hose is a greddy unit. I ve chased the wires and it seems that it must of had a greddy gauge set in the car before and someone has cut the wires under the dash and removed the gauge.
 
As its already all fitted and cables run, does anyone know if I can use the greddy sensor with a generic gauge? I purchased a temperature gauge of the internet(brand unknown), so it would be a result if I can just connect it straight to the cut cable under the dash.