the speedo is not a good look and I have been speedo free since '93. for your problem, I would replace the speedometer. jumping wires and messing around with the wiring is probably gonna cause problems in the future. modification and ol' fashioned rigging are two different things...just my two cents

 

I would say it safe to do. All Polaris have the same AWD system and many models have NO speedos whats so ever ,so you know there is a away to bypass the speedo and still have AWD.