hot to tell difference between 2 bar & 3 bar sensor?

[turbo_civic_si]

i was running an mf2 injector driver and i ordered what is supposed to be a 2 bar map sensor (about 2 years ago). i didn't have hondata then and now i'm thinking about using it for my hondata, but now i'm not sure if it is a 2 bar or a 3 bar. i checked the voltage and it shows around 1.6v (3 bar voltage). the numbers it has are 466 & 749 7218. i figured a 2 bar would probably be around 2.5v? should be a linear voltage. can anyone confirm this?