Finished wiring it all up today, and got the dash back in - works a treat!
I swapper the brake light & oil light around, so that the oil light is at the top where it is more visible.
I also replaced the globe with an LED globe which is nice & bright
Because I found that the 2 warning lights are actually slightly different sizes, I made new lenses out of a broken tale light & blinker lense.
Installed the timer switch, with a push button under the lower dash.
here's a little vid of the buzzer in action.
http://youtu.be/TDCWDzH2XXQ
Because I wired up the power supply for the timer from the ignition power, it activates the timer when you turn the ignition on. I've set the timer at about 2min 45sec, so you can turn the ignition on and the buzzer wont squeal until the timer deactivates.