Did the fans come on high before the sensor mod??
The mod does nothing different to any system it is installed in..it only changes the R value of the sensor at the same temp. So, it actually does nothing different except it fools the N/22 module into thinking that the temp is as spec , when in reality, what yuo now have is an "Out of Calibration "sensor..The ECU has no way to know this as it only reads OHMS, not TEMP. and has no other sensor to compare to.
In 93 , there was some aux fan changes , but I can not see them b/c they do not show K9 internals ..however, the V8s with different speeds usually has 2 dropping Resistor instead of 1 ..is that what you have.???