@Rich555 I ran into this same issue with a cheap SCA60C.
An analogRead() of the Vo pin goes from 0 to 363 (from 0 degrees to 90 degrees) and then reverses from 363 to 0 (from 90 degrees to 180 degrees). That reading of 363 fluctuates each time (+ or - 20) depending on the speed with which I tilt the sensor. 363 translate to about 1.77 volts.
The datasheet of the VTI chip (N1000060) on this board states that it should go from 0.5 v to 4.5 v (0 to 180 degrees). At this point, I am not experienced enough to triage if there is a an issue with the circuit board itself. I think I just got a bad sensor and will be replacing it.