Fuel sending units read WRONG time after time!

RedFish said

All the senders operate on the same range of 10 to 80 ohms except for the warning lamp senders/switches that open /infinite or closed/zero ohms. 1.4 ohms suggests a bad or wrong type sender.
What instrument panel is this ?
What IVR is supplying on 3 volts ?

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Yes these the temp and fuel gauges are basically operating as an ammeter. They are configured to measure the amount of current running thru them.

When I got the car there were at lease 15-20 wires running somewhere that were not connected in the correct place or not connected at all. The coolant temp sensor was connected to a wire that ran directly thru the firewall and then not connected to anything. The coolant sending unit has 1.4k (1,400) ohms thru it. The oil pressure sensor what not connected to anything. I found a wire about a foot away that was covered in grease. When I traced it I found it went to the oil press sender.
The instrument panel is what I call the instrument cluster.

you mention the IVR, I am not familiar with that abbreviation.

I still need to find the voltage drop I measure on the cluster PCB.
The car is drivable and the engine runs great, I still need to finish checking the wiring to the a/c blower motor switch so I can charge the ac