That's not an O'DAY 25 Manual, I have a copy of the same book that was provided by O'DAY to the original owner of my DS II. It is a great booklet from Neil Pryde Sails, but as mentioned...pretty general.
I have a copy of the O'DAY 25 Owners Manual (really it is based on 1978 model and later, but 99% of it applies to the full 1975-83 production run) I actually have expanded the original 2-sided 11" x 17" sheet to booklet form with added diagrams and updated to better cover the full 1975-83 production run. (I offer copies for $10 to cover printing and postage)
You could also contact Rudy at D&R Marine (508) 644-3001 he sells copies of that original 2-side sheet for around $7.00 plus $3.00 shipping.