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 I have a T56 magnum in my Unique.  I put a toggle switch on the dash that activates the reverse lock out solenoid. Reverse is all the way right and up.  It is VERY difficult to overpower the solenoid spring to engage reverse without activating the solenoid.  This is a great feature, and easy to wire in.  I have no need for the second switch activating a backup light/backup camera/etc. circuit, so that is not wired.  Additionally, I have a speedhut GPS speedo, so I have no speedo output wiring either.  
 There have been several threads debating the optimal OD gearing over the years:  apprx 0.82 vs apprx 0.64.  Just stick in the 6 speed and you don't have to choose!!
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