I’m asking for help from seniors or experts who know about these devices; it’s really strange~~~

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I encountered a level gauge of the sliding-contact type, in which a float moves a slider, causing a change in resistance; this change is then used to drive an analog pointer to indicate the liquid level. The display is inaccurate; I’m going to deal with it. I’ve disconnected the signal wire of the level gauge and used a multimeter to measure its resistance value. The value shown does not match the resistance value corresponding to the current liquid level, which indicates that there is a problem with the level gauge. Then I tried to use a force meter to simulate a resistance signal on the signal line, in order to ensure that the pointer would change properly as the resistance changed. However, I wasn’t able to do this no matter what I tried. The output resistance of the force meter, as measured with a multimeter, was fine; yet when it was connected to the signal line, the pointer wouldn’t move. Once the signal line was reconnected to the level gauge, the pointer returned to its original position. So I think the resistance signal simulated by Jingyi isn’t a pure resistor, right? Seek an explanation for the phenomenon!