Put in to bat by Madhya Pradesh, Tamil Nadu got off to a disastrous start, losing both their openers Washington Sundar (0) and skipper Abhinav Mukund (0) for a duck, to be reeling at two for one.
But Gandhi came to the team's rescue with a patient and responsible knock, and in the able company of Vijay Shankar, consolidated Tamil Nadu's innings.
Unfazed by Shankar's dismissal, Gandhi coupled with Karthik and the two shared a crucial 144-run partnership for the fourth wicket to bail Tamil Nadu out of trouble.
Karthik, who played a quick knock, however, missed out on a well-deserved hundred, getting out on 95 that came off 153 deliveries and was studded with 15 hits to the fence.
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Gandhi continued to play with a lot of patience and managed to remain unbeaten till the end of the day's play and also found another able partner in Baba Indrajith.
For Madhya Pradesh, Chandrakant Sakure (2/47) finished with two wickets.
Brief scores:
Tamil Nadu 1st innings: 262 for four in 85 overs (Dinesk Karthik 95, Kaushik Gandhi 71 batting, Baba Indrajith 44 batting; Chandrakant Sakure 2/47).