u/S3Plants

Hi all, just a quick question. My temp gauge on my Honda prelude 5th gen 1999 acts strange. It surges ever so slightly between the (bottom and top) lines on the little icon on the cluster. I have recently had the water pump and thermostat replaced from a mechanic shop. I have also personally checked that the coolant is bled correctly. Apon a small test drive the lower coolant hose is not getting as hot as the top. My thoughts is a dodgy or incorrect thermostat. Any advice?

(Picture for reference of minor surges) will go up and down within thoes lines whist driving every few minutes) also noticed the cooling fan was not running but fuses were good. Thanks