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is this like.. if a bear ****s in the popes hat, can you hear a tree fall over?
Bit of a long shot but with engine warm can you run a good earth to the outer casing of the sender
Keep it clear of the centre or near the green insulation
See if this livens up the gauge to somewhere civilised
I've heard of issues with non genuine senders but usually just failures rather than outright not working
Also is engine well earthed, I'm sure it is seen as it starts
Earths are good
Presume all the earth pins are good for gauges, there's 2 black and one black grey?
Worth making sure any crimped terminals are good with no excess insulation etc
Namely on the temp gauge wire rework just in case there's resistance issues
300? disco green one?
I wonder if the positive ign feed is part of the issue
Can you remove the white/green ign on wire power supply from temp gauge and run a new wire from battery positive temporarily to the temp gauge
Then try the accuracy of the gauge once engine is warmed up
Also try lights and heater to see if any changes occur
I'm suspecting power being robbed by the lighting circuit or heater dropping a few volts
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