The bonus to the saving throw for high wisdom - I think that applies only to a priest (clerec and druids), as far as I remember the AD&D 2nd edition rules.
As for the adjustment of armour class (AC), only dexterity has an effect. With a Dex of 18 you get +4 to your AC (infact this value is going to be subtracted from your AC, to get a better AC with high dex).
Insane
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