Re: Ignition Question- MSD?
Just stick with the MSD6A box or the Off-road version if you are concerned about water. The programmable timing control is for racing engines where detonation becomes a concern. The guys who are in the market for these typically have turbos, blowers, and/or nitrous injection on a high horsepower engine. In order to properly program it to change the timing (it's not automatic) you have to know at what point in your ignition curve detonation is occuring and how much the timing needs to be retarded. This requires time at the track and the distributors timing curve to be determined beforehand. In other words, a waste of time and money for a street vehicle. Check Summit Racing or Jegs for the best prices.
'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274