(G) uno mk1 ignition switch wiring

Hi fiat techs,

My ignition switch has fallen apart and I have decided to replace it
with another (non-fiat) key switch and starter button, mounted in
the central console. I am trying to work out what the yellow, l.blue & white
and l.blue cables do and in what order.....
The haynes manual seems to have an error between diagrams 22 and 24,
for 1301cc UT and i can't make sense of how the switch works...
It looks like Park : Off : Power : Ignition : Starter, but i am sure there is
more to this...don't wanna fry my electrics experimenting....
I have never used Park setting on my old ignition switch, and the replacement
key switch is PARK : IGNITION : STARTER ....i am not using the instantaneous
starter setting, cos it's being done by the starter button....

it's just those pesky other cables....????

mike