Installing ProSport Boost Gauge - Which wires to where?

Unlike the gauge I have now, this one takes a reading from a boost pressure sensor.

Now, all the vac hose side of things I'm fine with, as I'll just use the hose already present.

The question I have, is where should wire the gauge wires into.

On the gauge I have in now, it is just wired to the cig lighter, as it was only temporary. It works absolutely fine that way, but would I benefit by wiring it elsewhere?

Attached is a photo of the instructions

I think I've just worked it out

Except, what does "ACC" mean? (in box 7 on instructions)

ACC is the 12v.

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i.e. if you don't have the 2nd wire connected, it won't change with the headlights. Hence 'No connect' for those options. Used to have Prosports in my old MR2 - which one have you got?

So, this is how I understand it for red (amber) lighting:

Red wire - Pos on ignition

Black - Neg on ignition????

Green - boost sensor

Orange - Pos on ignition

Is that right???

Yes. Assuming amber is the secondary colour.

I have this one

But mine doesn't have Peak on it (unless they sent me the wrong (and more expensive) one)

I'll find out when I wire it in.

Yes. Assuming amber is the secondary colour.

I want the amber as the only colour.

It states in the instructions connect orange wire to ACC and not to connect the white wire.

So I just connect the amber wire to a positive power source?