Hey and welcome to TN. Props for searching before posting
As for your questions, not sure about the tachometer question, I'm sure someone else can help on that.
For the HIR bulbs, the only place you really can find them now is ebay. I did hear about people finding them at local John Deere parts retailers a couple years ago, but it depends on if the one in your area carries them. I called up mine a couple of weeks ago because I plan on getting them and they didn't even know what they were

For the modding of HIR bulbs to fit 9006/9005, see:
http://shnu.us/HIR%20Trimming%20Stock.htm
and this has some more info on trimming:
HIR Bulb review
as for the TRD grille logo itself, they have 'em on ebay, sometimes here, and a few other sites, but I'm not sure what exactly you are asking. I believe most people who have a TRD logo end up doing the mesh grille conversion and sticking it on there (see -
Clear your Gen 3 Grille DIY *Pics*) This is what I am actually in the process of doing right now

Hope I helped you.
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1992 Toyota Camry LE 5SFE 4 cyl. 2.2L
A.K.A. "Ron Burgundy"
198,000 mi. (as of February 9th, 2010) and counting