Chevrolet astro 96 it doesn't start and the"check the gages" light turns on

It is normal for the light to be lit if the key is on and the engine is off, it comes on when there is no oil pressure and since the engine is not running there is no oil pressure. When you say "wont start" do you mean cranks over but wont run or when you turn the key nothing happens, or you turn the key and ther is a click but that's it These conditions are very diffeant and the diagnosis will take an entirely differant path depending on which it is. Give a few more details and try your post again. If it cranks but won't start the most likley cause is the fuel pump.