briansmart
I believe (I researched when I first got my 450) a TAN code is needed to be programed in to the SAM unit by a dealer in order to activate it ( I may be wrong),
When I was researching trip computers, I found a comb that worked with the G&K converted Smart, this has a Tach feature in it so I stopped my search then.
You may (if a TAN code is really needed) ship the SAM to a dealer, they'll program it and send it back (of course for a fee).
ASM