Each floor plan is a little different on where sensors are located...but the Tecma sensors are pretty easy to spot. Mid is Yellow, high is red.
On the 37RB in the XL that I looked at, the Tecma sensors were on the passenger side. It is a wedge shaped tank with the small side benign the passenger side, so there is very little room for moving the sensors. Also, if things are not completely level or there are things caught in the small side, you may get false readings.
Moving the sensors to the larger side of the tank may help.
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