6 volt positive ground signal light question

[benbuilder]

I just got a truck with no signal lights.
no cowl lights. 6 volt, positive ground.
I bought some motorcycle 6 volt lights to use as signal lights.
I bought this aftermarket switch to install from speedway 910-62860.
I intend to use signal lights independent of the brake light. So no connection to the factory harness.
My question is. Do i connect the RED to the positive of the battery or the negative of the battery?
The second image shows it going to the + of the battery. but this may be for a negative ground application?
I have spent hours on line looking.

I know, stupid question.