Apparently, Kamal Haasan was not the first to remake a Govind Nihalani film in Tamil. Which was the first film?

Gasp! A film no less than Ardh Satya was remade in Tamil as Kaval (காவல்), an all-out B-movie embellished with item song(s), starring Thyagarajan. (I wonder if Nihalani was credited.)

Courtesy:
1. K TV, for telecasting this film on their esteemed morning show, a few minutes of which I caught. I spent a couple of hours on the net, in vain, looking for the film’s title.
2. The Indian Cinema Database. (Thanks to which I was finally redeemed a few minutes ago.)