Ford's (F 0.30%) share price has steadily increased since July due to strong sales, which have been strong across the board for automakers in the U.S. Motley Fool industrials analyst Blake Bos gives us a few things investors should watch with Ford in 2013, to know whether it can keep riding this trend. Which models were big sellers last year and which ones are projected to be big this year? What is important to watch regarding performance in Europe and China? Also, if you're thinking of getting into this stock, he notes that the P/E ratio is historically low at the moment.