On my 72 Scamp, I'm having issues with the fuel gauge. The issue is that the gauge will only go up to around 1/8 of a tank while there is a little over 10 gallons. The Sending unit is brand new from OER and Is putting out around 40 Ohms. I tried a different dash I had laying around and the fuel gauge worked so I swapped that one out and then bam the same problem but now on both gauges, so then I suspected it may be the Voltage limiter and that it fried the gauge, so new gauge and limiter and it is still having the same problem but now the gauge goes to the correct level then drops back down to 1/8 tank. What could be causing this? Here is a video of the issue.