[boxhead]

You will need seat belt lights, also a hazard light switch (if switch does not have a light then you will need one for this too).
An oil warning light is good as it is much easier to see at a glance (or gets your attention) if it lights up.
A master switch is good to have, but does not need to be in the dash.
With your light switch, it will be park and low beams, high beam will be controlled by switch on indicator stalk.
Your ECU will have output for check light, will also have output for oil light.
I did not run a switch for fuel pump, I instead used the output from ecu to trigger this, I ran the trigger to a relay, relay powers the fuel pump.
I did not fit a demister or wipers/washers as I had an aero screen fitted originally.

I have wiring pin outs for ecu to suit LS1 if it helps?