Dean C Garfield, president and CEO of Information Technology Industry Council and Grant Seiffert, president, Telecommunications Industry Association.
In their letter they said, US industry has raised concerns repeatedly for the past year with the Indian officials, including the Prime Minister's Office.
Senior public officials have admitted that India lacks the testing capacity to implement the rules and appear to understand the enormous costs and disruptions they are causing for companies.
"More specifically, senior US industry representatives in meetings with the Prime Minister's Office in June of this year were provided unambiguous verbal assurances that the implementation deadline would be extended and that certain exemptions, including those for Highly Specialised Equipment, would be provided to ease pressure on companies," the letter said.
Meanwhile in a policy blog, Joshua Rosenberg of ITI said India's proposed registration plan is a market access barrier.
"While the Prime Minister put the forced localisation proposal in abeyance -- a decision that is good for both the Indian economy and economies around the world -- there's no word on when or whether the GoI (Government of India) will take forced localisation in the PMA context completely off the table. An official announcement to that effect would be a welcome announcement during the Prime Minister's visit," he wrote.
The industry, he said has urged the Indian government to delay the October 3 compulsory registration requirement, and to consider approaches that are consistent with international standards and practices.
"We also have urged leading US government officials to make a similar request to their Indian counterparts. Doing so is in the mutual interest of both governments and both economies," he wrote.
"We hope that, during his visit, the Prime Minister will gain a greater understanding of these concerns and work to develop approaches that drive progress for all sides, and don't jeopardise his country's current and future successes in the global economy," Rosenberg said.