I took my 94 sea rayder to mechanic due to the top cyl not getting spark. He said the switchbox is bad and suggested it be replaced. I have the CDI unit in there now and found one online for 1/2 of what he's charging. My question is I have decent mechanical skills and doing it myself will save me almost $100. How hard is it to replace and is it changing one wire at a time easy? Thanks in advance