Wiring the DRL package isn't hard. Just follow the Hamsar directions. Where (if) it suggests hooking to a spark plug wire, splice onto a wire from the oil pressure sender. On my 02 Taco 2.7 the wire is yellow with a green stripe. It come up from underneath and runs across the top of the engine in the direction of the rad. It was an easy splice, once I got through the protective layers. The rest of the package is scary, but not difficult.
On my blog I mentioned using some of my own wire splices as the ones which came in the kit were dull. The email address of a help desk at Hamsar is also listed in one of the seven articles on the topic of importing the Taco.
The last (first) article in the series deals with how to tell if your Taco is a California model. This became relevant when error #P1135 popped up. This confused the Toyota service guys, as only California trucks have that Lexus part. It all sorted out well.
Good luck,
Rod
Importing a Tacoma to Canada « Walnut Diary