Could you provide us with information of which back up camera you installed please? A link would be even better! Thank you.
Links get broken - but just FYI - I've installed the sensors and a cam. The sensors are pretty useless because at like 1.5 - 2 feet they indicate you are touching... Most of the cameras now a-days (from China) come with burnt in distance lines. So as you backup, it's very easy to judge how close you are (and you can get very close) - I'd just go that route - for the front - i'd use my eyes... Look on Ebay - you'll find one that matches your car most likely - figure out where it's supposed to mount - and what they look like. I have a new Prius - figured out it looked exactly like the Camry. Dealer wanted $250 for the part - EBay was $40 delivered with the nice lines - and a VERY clear image (I can see if a dime is heads or tails - in color).