[SeanPaintsFlames]

I think the circuit grounds to the block. Power comes into the gauges, out to the sender, and the sender gives it a limited amount of ground, giving the gauge a limited reading. If it gets a full ground somewhere before the sender, it just thinks it's "wide open". I'd look for a wire rubbed against metal somewhere between the gauge and the sender. Like, through a hole without a grommet sort-of-thing.

I guess if the sender itself is bad it could read full. I always thought they wouldn't read anything if they were broken...?