Correct, the Tach should have no markings on the housig at all. No emblems etc... If you can get it for a good price, it can easily be corrected. Maybe even use this info as a barganing tool since they "damaged" it with the emblems...

But a hood tach is a very good thing!

Good luck - Brett in Seattle - 67 vert 455!
(400 hood/hood tach!)