We wouldn't recommend installing a touch screen in Alto 800 as it may void or hamper your car's warranty. Moreover, we'd suggest you have a word with the nearest authorised [service centre@https://www.cardekho.com/car-service-center.htm
The exact information regarding the CSD prices of the car can be only available at the authorized dealerships. We would suggest you to visit the nearest authorized dealership for further information. Click on the given link and select your city accordingly for dealership details.