the white wire from the 6530 goes to the white on the grid.
just like the drawing below. ( all 6 series would hook this way)

now, as far as the rev limiter...( your not using the legacy cable) .........there is no external inputs on the 6530,6520, 6425,7520

so , this means you can ONLY use the internal rev limits in those boxes( 6530,6520, 6425,7520). The timing
features on the grid will only be used .