I can say that there are many pilots that are running this sensor with Spirit with no issue. Usually the problem is just in the magnet polarity.
So from what I can say, there is no compatibility issue with Spartan RPM sensor. This is also why we are listing this sensor between tested and supported in our Governor Wiki pages. Because it was tested enough and always worked well. Can you take a photos of how it is connected?
You can take advantage of this page:
http://manual.spirit-system.com/index.p ... RPM_SensorThe connection is slightly different (wire colors), but everything else is same.
Regarding the test screen - Sensor Activity, we have released the update in where it was fixing the indicator in case of some sensors. The issue was occuring only with Spirit Pro units and was not affecting anything else, just the indicator.
Can you describe the issue you are seeing? Unfortunately I am not aware there is anything wrong. I am confused now, if the issue is just indicator or something else?
If you are talking about "The spirit Pro does not even recognize the sensor in the test screen" then this was solved in 2.4.0 - see ChangeLog. Did you tested it with this version? It is released for few weeks now.
If you still can't see any activity with 2.4.0 then the sensor connection is wrong or the magnet polarity is not OK. Did you tried to swap the units as mentioned earlier? By this you can simply check if the unit is really wrong. I am convinced that both are OK.
I can't comment about other units, but if you believe they work better, feel free to use it.