hey mate , good to see you have a proper go of things yourself.
had a read through excellent project well done.
the back of hz combo gauge has a red link wire that goes between the two red 5v pins. (on mine) just pulled it apart a week ago. asume is right, gauges were working before i stripped them. can get you a photo if you need. see if that helps. cheers


			
					
				
					
					
					
						
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 Yeah, my HZ gauges have the posts for the red wiring, but no wiring!! 
 lol A photo would be a great help.. 
 I pulled the cover off it, and sure enough the shop had put 3 stainless steel washers over the push stick of the trip meter.. The washers were fouling on the frame of the speedo and not allowing the thing to turn back to 0.. 
 I'm getting abit sick of it :(
						
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