Add in some more specifics. How many people, how many hours? A small private tour using a car for 2 people is a whole different thing from a bus tour with 15 people. (or more)
Tips should completely depend on the quality of the tour and the service you get. This should be spontaneous and not a set, decide-before-hand deal. Did you love the tour, was the guide passionate about what they were showing you, were they always polite and considerate? Is the tip being divided up between a large group of people or just you and your partner? 1000 € sounds like a ton of money if it is just the 2 of you.
Other than that, anywhere from 5-10 % is appropriate for the guide. I wouldn't give very much to the driver unless you felt they did something exceptional, or this was a super long trip. Buy their lunch and their drinks during the day and toss in 10 €. Again, if this is a bus tour, the amounts should be much, much smaller. A few € from each participant for the guide, maybe up to 5 € if the tour was outstanding.