I found this on the Blackbird site. Looks like it might be a workable solution for the Busa too:
Okay folks, for those of you who, like me, don't want the HID ballast cycling twice while starting up, but can't find a Euro-spec thottle-side set of bar switches that can be bought for less than the price of your left testicle, I have a solution. I just finished doing this on my bird and it works perfectly!
*Warning* This involves cutting and soldering to your wiring harness and is not for the inept or faint at heart. Jean-Claude, this means you. I am unable to upload pics at the moment, so I will have to try to do this without visual aids.
Alright, the list of materials for this mod is pretty short. All this really takes is a few feet of 18ga wire, some male and female spade connectors, heat shrink tubing, and a 5-pin relay. This is simply a relay that will have a "normally closed" pin (usually marked 87a or 87q) as well as the usual "normally open" pin (marked 87). I won't teach anyone to solder as Smurf has already done a marvelous job of that in his Acumen DV8 install thread.
Okay, here it is. Install your bulb and mount your ballast if you haven't already done so. I found that mine quite nicely tucked in behind the instrument panel and a couple of tie straps hold it there perfectly. My kit included a totally useless rubber grommet (which the instructions referred to as "rubber gourmet" in an obvious reference to JClaude's cooking) which did nothing except make the wires difficult to manage so I removed it.
Now you will need use your handy dandy Haynes manual to identify two wires in the harness that supplies the instrument cluster. One is the oil pressure switch wire, and the other is the positive feed to the oil pressure warning lamp. These are going to trigger the relay coil. You need to splice into each of these with a length of the 18 gauge wire, decide where to mount the relay (somewhere that the original headlamp wiring will reach as you will need these to feed the ballast via the relay). Solder a female spade connector to each of these and attatch them to the coil terminals of the relay (pins 85 and 86). This will "open" the switch in the relay when the key is turned on and the oil pressure lamp is lit.
I found it easier to remove the spade connectors from the OEM headlamp plug. This can be accomplished by using a small pair of needle nose pliers to squeeze the barb in the side of the connector. The black wire from the ballast can then plug into the connector on the green wire from the headlamp plug. The other wire from the headlamp plug should go to pin 30 on the relay. Ths leaves the red wire from the ballast. You will need to remove the male connector it came with and solder on a female connector. This goes to pin 87a (or 87q), not pin 87.
The HID will not be energized until the engine is running and the oil pressure warning lamp has extinguished.
