Temp gauge on a 1981 model 2705

Temp gauge isn’t working on my 2705 with the 354 Perkins. i want to check the sending unit and have removed the hood to power wash the engine. Still can’t find the sending unit. Would someone help me out and tell me where it is?
 
Found it
On the water pump housing
Was covered in oily dirt and couldn't see it.
 

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The guage is powered from the dash cluster with the fuel guage. Many times it's the brown ribbon cable connection that fails. That causes the guage to appear as it failed.
 
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