I am using the GPS gauges and an MSD 6AL ignition and am confused about the tachometer wiring...help please!

Yellow from the tachometer per the instruction is "negative coil / tach output"...where should this wire terminate?

I have the purple (coil to tach) going to the grey tach output wire of the MSD ...is this correct?

The MSD instructions are clear in that on the orange and black wires are the ONLY wires connected to the coil.

thanks in advance for the help...