You will find that the 2 pack of relays is great for testing different wiring ideas.
EHDIS 2 Packs Car Relay with Harness Truck Motor Heavy Duty 5-Pin 80A 12V Rel…
You will find that the 2 pack saves you from ordering a single relay when you need more.
You will find that the 2 pack is a simple way to cover both old and new setups.