All down to personal taste .... there are a few options depending on what style you are after.
i.e stock, stock led's, JDM clear Led's, then all the lexus aftermarket style.
Personally I just like the stock look led's on the Azure.
Yes the RPM one is hard, the Speedo is even more difficult!!!! Spoke to someone on my350z.com who suggested I go out with someone get to 60 then jam the needle on!!! - I would not every suggest doing this!!!
Right I will try and do this in the most logical way possible ... Starting in the centre glove box you get the 'ipod looking connector ...
This now the spiral cable disappears down the small 2 inch square cover.... from there is is now chased behind the sub/ or glove box depending on whether you have bose or base (Drivers Side)
The back lead under the two relays is the other end of the ipod like phone connection.
Once removed the cable is like..
White end plug ...
BACK TO THE CAR ... and Back to the black wire ....
In pic two you can see the lead heads north towards the DVD Rom Player to power the sat nav..... and yes this is exactly where it heads ....
Once the DVD player was removed the lead led up to a single block ...
The issue here is that the wire splits just before the block, three wires
Which then goes into a quikclip block
Just to show the location of this wiring block.
And finally the otherside of the block...
After this block the three wires appear to go into the main loom running along the back of the speak mounts (large black wiring surround (approx 1 inch thick)
This is where I stopped - hope it is useful