Progress Thread Goofy fuel gauge on slow progress

General karthief said:

After checking 'the magic book' it refers to using a ford tool that likely nobody has, I really want to collect some of these test tools, they are out there someplace but the book gives resistance readings for the sender so a VOM can be used for that:
145 ohms at full
22.5 at empty
Question #1 (GT model only) does the low fuel light work?
Note: GT model only, not sure if this is all GTs, mine is an 89.
#2 does the gauge stay in place when key is switched off?

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#2. Pretty much. It stays where it is as long as I want to sit there and watch. It might not read right next time I get in though. Is that good or bad?

The gauge was in the middle when I got in the car this AM (not right, I had 3/4 of a tank). I tuned the key to the on position and the needle did not move. After it ran a bit, I turned the ignition switch on and off twice and the needle moved the second time.
And this afternoon the needle stays in place when off.
The reading drops a bit when the ac is blowing and the engine is off, and a bit more when the starter is hit, vs. when the when the engine is running. So now it’s moving when on instead of stuck.