I unfortunately did the same thing, bought the navigator thinking it would read everything. You can have a wideband o2 sensor installed and connected to the vpro but it would need to be enabled through the HKS power writer software. There is also an HKS Knock Amp which is quite a bit cheaper (slightly older) that works with the vpro, again that would need to be enabled through the power writer.so i'd need to pay for a a/f knock amp as well? thats costs more then the actual navigator!! the only reason i bought the fcon navigator was for the knock and a/f as i already have gauages for everything that it shows now.
Could you advise the cheapest way to get those two readings working?