He was elected to the
Rajya Sabha in 1972 and was appointed the Union Minister for Railways. In 1973, he was given the responsibility for the newly created Ministry of Heavy Industries, and subsequently, additional charge of the Ministry of Steel and Mines. Pai took over the responsibility of the Ministry of Industry and Civil Supplies in 1974. He represented
Udupi Lok Sabha constituency in 1977 as an
Indian National Congress candidate. In 1979 when
D. Devaraj Urs parted ways with
Indian National Congress and created
Indian National Congress (U), Pai joined him and moved to the new party. In the
1980 Indian general election he contested again from
Udupi (Lok Sabha constituency) as a nominee of
Indian National Congress (U) and lost elections to
Oscar Fernandes. In 1977, Pai was one among the three ministers from the cabinet of
Indira Gandhi who were examined by
Shah Commission on emergency excesses. Pai gave testimony against
Indira Gandhi saying the ministry was 'under siege' and he protested the decisions. The 1998 book by
Australian journalist,
Hamish McDonald titled
The Polyester Prince made references about Pai and his relationship with
Dhirubhai Ambani. The book that was banned in
India accused that there was gross tax minimization done during Pai's tenure by
Reliance Industries by using a company named MyNylon Ltd. a private limited company incorporated in 1973 by Pai family at
Karnataka. ==Awards==