this is the latest manual version ARMY TM 9-2815-237-34P (for what i know) as integration and support of the old ARMY TM-9-2815-237-34.pdf
want to share with who need it
my Yucon is 95 so to read the correct RPM i must have diesel pulley on alternator (2-5/8" OD)
upgraded my alternator to CS-244, more reable, and works fine from more then 10 years
but it cames with gasser pulley, also later diesel alternators 96-99 works with smaller gasser pulley (2-3/8" OD)...