Fuel Gauge Issue
39 is going to be closer to 1/4 tank
Look at the ohms to gallons chart.
The gauge needs a curve but most aftermarket senders do not provide a curve so it is off from that too
The tank is not rectangular the top has the cutout for the spare, so the first 5 gallons go down fast, the next 6 to 8 go pretty liner, then the tank is sloped so the last 5 or so go quicker but not as quick as the top 5
Product Review: A100 Fuel Sender For 67 Dart
39 is going to be closer to 1/4 tank
Look at the ohms to gallons chart.
The gauge needs a curve but most aftermarket senders do not provide a curve so it is off from that too
The tank is not rectangular the top has the cutout for the spare, so the first 5 gallons go down fast, the next 6 to 8 go pretty liner, then the tank is sloped so the last 5 or so go quicker but not as quick as the top 5
Product Review: A100 Fuel Sender For 67 Dart