New Delhi: The Centre will shortly tap various ministries for inputs on tariff and policy tweaks to enhance market access for American goods and services ahead of upcoming trade talks with the US, four people aware of the plans said. The changes will aim to support US companies, educational institutions, and research in sectors such as space, agriculture, pharmaceuticals and high-value manufacturing. The commerce ministry, which will steer negotiations for the India-US Bilateral Trade Agreement (BTA), will soon send out a checklist to the ministries of defence, electronics and information technology, consumer affairs, agriculture, education, mines, steel, heavy industries, science…