Take it to a sailmaker
There is a lot of force exerted on the tack of the sail. Not knowing much about the tear, the best advice is to take the sail to a sailmaker for repair. The last thing you need is for the tack to rip out due to an inadequate repair resulting in loss of the sail (and other potential consequential damage).The next time you leave the boat, take the main with you and drop it off at your friendly, local, neighborhood sail maker. Unless the rip is very bad structurally, you should get the sail back in time for your next weeks sail for a very reasonable price.I had a 20 year old sail on my previous Cal 27 that ripped out along the reef points. The local sail maker (currently a Doyle / Boston loft) cut out the damaged portion of the sail, sewed in a new bit of cloth, reinforced the reef points, and I was back in business for the next week of sailing.It's important to get the tack properly reinforced.SteveAlchemist C-320