Well, my service manual for 1972 says 16.5 gallons total capacity.
If the tank held more than 16 gallons, then it should be reading more than half as I only took 5 gallons out of it plus the gas used in the 27 miles since I filled up. So either way it would be wrong.
No matter how much I bent the arm up or down in the factory-bent spot I couldn't get it to read half a tank which it should be reading. At some point, in fact, bending the rod down more just makes the reading go the opposite way because the float swings in an arc.....
Now that was bending at the "factory" bend.
Checking the gauge with the sender hooked up outside the tank before I bent it, I found that when the float was maxed out to the "top" stop, the gauge barely read full. So it was off a bit anyways on that end. The sweep was still smooth.....
I just tried bending the rod closer to the pivot....that effectively changes the ohms reading at a given location, but it also changes the max and minimum readings.
I bent it several times till I read half a tank when installed in the tank.
Got it to that point now. Added the 5 gallons of gas back in and now I am reading way over full. It should read slighly less I would think
It would be better I guess to fill the tank full and then tweak the sender till it reads just perfect on full...but that aint doable realistically.
So I will try it like this I guess for now....At least I know that when I have a half tank I should have a half tank...or 8-9 gallons......LOL
I wonder how much time Roseville gives for returns?
At this point I will have to fill up again and burn down the tank of gas, using my previous mileage readings (10-12.5 mpg) to see where I stand. My guess is that it will still read some-what wrong...may drop fast or something.....but hopefully at half and below it will read accurately. Thats where you really need accuracy if you have to pick a region I guess.
My last gas mileage reading was 12.5 mpg....went 27 miles since the last fillup....so yeah it should read pretty full I guess....but way over full, I don't know.
FYI, the ohms read at about 4.5 when "full" using the stop......the "empty reading is less than the 75 ohms originally...this may mean that I will be showing some gas in the tank when its actually empty now that I sit and think about it......so most likely will have to weak some more...
I guess we will see...this is so frustrating.