Gas gauge accuracy

I'm wanting to make my gas gauge a little more accurate. Right now, when the tank is empty, the gauge reads 1/2 full. I put in a new sending unit. The tank is out of a mid 70's CJ and I have it in a 1953 M38-a1. I found some data, but don't know if this is what the gauge wants to read, or if this is what the sending unit sends...

73 ohms empty
23 ohms 1/2 full
10 ohms full.

I'm thinking that I can put some resistors inline somewhere to make the gauge work a little better, but don't really know how to use a multimeter (which I have) and what the numbers mean. Anyone messed with any of this kind of stuff?

Dondo

 

Ya may want to try pulling the sender and check to see that it is not bent limiting it's travel befor you add resistors. $.02

 

Pull the sender, and wire it up. It should be lots better than that. 75 ohm sounds about right, but "Full" should be 0 ohms. Don't go crazy with the wheatstone bridge yet. Also check that your drop regulator is providing something around 5 - 7 volts. It pulses, so this is kinda abstract...

-Hill

 

Randy hit it on the head....Pull the sender. Measure from the top of the inside of the tank to the bottom where the float will rest. Wire up the sending unit and bend the arm till you get an E reading at the measured depth(I like to make it a tad below E. This prompts you to refill while there is still a bit of fuel left in the tank) from the bottom of the sender to the bottom of the float. Double check the F reading by bringing the float up the the estimated "full" point.