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.. 
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