I have a 1997 Evinrude Intruder 175 I replaced the pack on a few months back....last week it started having power problems again and I did a spark test and it seems to be a failed pack AGAIN! I'm going to replace the optical sensor with it this time and probably coils to just because. My question is...on top of this motor there is the "timing wheel" with all the degrees and so on on it. When I take the center bolt off to remove that timing wheel to get to the screws to remove the sensor do I have to have the timing adjusted when I put the new sensor on and then asseble that timing cap and tighten the bolt back down or should it be fine?