Hi and thank you for your question.
I reviewed your exchange with Kenny and actually discussed it with him.
I do not have good news. In all likelihood, you have damaged either the meter or the ECU. The only reason you would get the big E display on your multi-function gauge is the ECU is not communicating with the gauge (open circuit). In slang terms something more than likely got fried in the jump starting process. Without being there to see exactly how all that went down, there are too many variables to be able to definitively state exactly what caused the failure.
Since there are no tests per se for this problem, the only thing that can be done is swap either the meter or the ECU with a known good unit. However, before you do that, you should have a good battery that is fully charged. On that note, I am taking for granted you have resolved what ever the issue was that prompted the need for a jump start. If you have not resolved that issue, you need to do that first. If the battery was just low on charge, make sure it has been recharged before attempting to power up the electrical system on the SXS or trying to start it. If the battery has been tested and passed a static, unloaded volt test, you may proceed with the component swaps.
The other sad reality is unless you know someone that has the same unit as you, you might be forced to take it to a shop to allow them to swap components with known good parts. It could end up being less expensive in the long run by taking it to a dealer for diagnosis as opposed to guessing at which component to replace, either the ECU or Meter, because if you guess wrong, there are no returns on electrical parts. The meter is about $340 retail and the ECU is about $600 retail. You may end up buying one of them, but as least you wont end up buying both if you guess wrong.
If you need further assistance, let me know