At the close of play, Kishan was batting on 86 off 141 balls with the help of 12 boundaries and one six, while Vihari scored 63 off 170 balls.
Opting to bat, South Africa A rode on a fifty each from opener Sarel Erwee (75) and middle-order duo of Tony de Zorki (58) and Khaya Zondo (56)
In pursuit of a 234-run target, India were going along nicely at 155 for three in their second innings when bad light forced an early stumps. India had more than 20 overs at their disposal and needed to score 79 runs but the weather conditions did not improve.
Vihari was batting on 45 at the close of play, having found the fence six times while facing 146 balls. India A trailed by 99 runs with half their side remaining.
Speedsters Navdeep Saini (2/54), who has lost his place in the Indian team, Ishan Porel (2/26) and left-armer Arzan Nagwaswalla (1/44) shared five wickets among them.
The first four-day game ended in a draw due to inclement weather on Friday last week even as the detection of the B.1.1.529 COVID-19 variant, which was named Omicron by the WHO, forced many countries to impose international travel restrictions on South Africa.
Abhimanyu Easwaran compiled a solid hundred in the game but skipper Priyank Panchal missed out on one by only four runs. The bowlers struggled with the hosts piling on the runs.
The 26-year-old Easwaran made 103 off 209 balls and hit 16 boundaries during his stay in the middle. Right after getting to the three-figure mark, he was dismissed by fast-medium bowler Lutho Sipamla.
Earlier, South Africa A batsmen continued to dominate the India A bowlers as the home side added 166 runs from 45.3 overs before declaring their first innings at 509 for seven from 135.3 overs.
Earlier on Tuesday, the BCCI also announced the India A squad for the tour with Gujarat's Priyank Panchal named as captain of the team that also comprises Prithvi Shaw, Navdeep Saini and Umran Malik.
Aiden Markram and Wiaan Mulder scored centuries as South Africa A made a strong comeback in the second unofficial Test against India A.
The spinning duo of Kuldeep Yadav and Shahbaz Nadeem gave India A an upper hand against South Africa A in the second unofficial Test.
Shubman Gill was the star of the day as the youngster scored 92 to put India A in a strong position at the end of the first day of the second unofficial Test against South Africa A.
After pocketing the five-match unofficial ODI series 4-1, India 'A' continued their domination over South Africa A in the Test rubber by winning the first game by seven wickets.
India A cruised to a comfortable 7-wicket victory in the first unofficial Test against South Africa A.
Jalaj Saxena, whose unbeaten 61 helped India A open up a 139-run first-innings lead, starred with the ball too picking up two of the four wickets to fall in the day.
Shubman Gill scored 90 from 153 balls (13x4, 1x6) as Jalaj Saxena also gave his skipper support after India 'A' were reduced to 199/7 at one stage.
India A put on a commanding performance on Day 1 of the first four-day Test match against South Africa A, as the visitors' tough tour continues.
KS Bharat will also be someone, whom the selectors will have an eye on after his consistent performances in the domestic circuit.
Sanju Samson scored 91 off just 48 deliveries as India A beat South Africa in the rain-hit fifth ODI by 36 runs to seal the five-match series 4-1.
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