LM-1 but no rpm converter question.
 

I am going to be useing an LM1 a friend at my new work has. My question is, is the data really valid if no rpm etc is with it?
Can I sync up (start recording LM1 and TTS datamaster at same time)my TTS Datamaster and hit "record" at the same time and get a good idea of what it is doing?
PCMforLess did a fantastic tune on it, and now that I found my vacuum leak at my IAC, I want to drive with the LM1 and get valid data that can be used to fine tune the Vette?
Thanks in Advance.