It needs all eight. These are the pins.

1

0.35

BU/BK

5719

Ignition Mode Switch Start LED Signal

I

--

2 0.35

BN/BK

5720

Ignition Mode Switch Accessory LED Signal

I

--

3 0.35

BK/WH

1851

Ground 18

I

--

4 0.35

BU/GN

5723

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