Gas Gauge/Sending Unit problem

Dana67Dart said
Here are additional graphs I made with the A100 sender and also added the resistance needed to cause MY gauge to read E, 1/4, 1/2, 3/4 and F.

Notice that the Spectra has 48 ohms at 1/2 tank. 48 ohms should have been at under 1/4 tank. The A100 reads about the same.

That's why your gauge reads 1/4 to E when you have 9 gallons of gas

Additionally I just today found this info in my 67 FSM

Empty is 73 +/- 12 ohms (61 to 85)
Full is 9.6 +/- 1 ohm (8.6 to 10.6)

View attachment 1715854248 View attachment 1715854249

Thanks Dana67, I forgot who had done all this great work.. What is not clear from the graphs is the "feeling" driving the car". The short arm junker that drops faster in the beginning make anyone who does not really understand what is happening very uncomfortable.. the gauge gets down to 1/4 tank or lower on the gauge very fast and even though you know you have more than 5 gallons left you end up counting miles to make sure... The A100 has a much more comfortable feel when driving and traveling. It does not stay full then drop to 1/4 in 40 miles like the short arm so it is not so stressful for the driver. I have the short arm in the daughters Duster and the A100 in the wife's Dart and the difference is noticeable.. The daughter is constantly telling me she is low on gas and I keep explaining the gauge is inaccurate.. the wife only complains near the end of the tank because of that dip right at the end.