One index which better reflects undercurrent of the economy & should be watched before Nifty

As a country, we are obsessed with the Nifty50, Bank Nifty, and the Nifty Midcap Index. We don't bother to look at other indices. Of course, many are not worth looking at because they are there just for the sake of it. But there is one that probably meets, to some extent, the purpose of an index as an indicator of the “health of the economy”. How so? Consider its constituents: A company making HCV/LCVs; a port operator straddling the western and eastern coasts of India; a container company; a tyre company; a railway ticketing platform; an auto ancillary firm; a passenger car company; and many others. How do these companies reflect the health of the economy?