Wiring advice for a chainsaw p'up.

[Dan-d-1985]

Hey folks, I managed to get a chainsaw p'up which I'm going to install into my Mira to see how it fares.

I'm just wanting to confirm which wires are which before doing the change.

I'm going on the theory that it's like an HFS:

Black - Hot

White - Ground

Red - Tap

Does anyone know for sure that this is the case or if it's different?

Thanks in advance!