Answer:
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
Take one out and scratch my head I am now black but once was red.
Mountains will crumble and temples will fall. And no man can survive its endless call.
All about the house, with his lady he dances, yet he always works, and never romances.
I am so simple that I can only point. Yet I guide men all over the world.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?