LC-1 XD-16 Standalone But I want Datalogging

ya I may need a hand setting it up ( I dont know what they mean by 0.5 voltage and setting up values and shit), and getting crash course on it.

Im just wondering what would be more acturate, OT-1 or SSI-4
Hell! if I get either or, when I want to tune I could just take my wheels off, set the car on blocks, and do a pull in 4th gear to tune my fuel