For those interested in buying the ultraguage, the process you have to go through to get that measly $9 rebate and registration will cost WAY MORE THAN $9 of your time!! After reding some info you actually need to do a test on the guage while its on the car, and input a whole bunch of numbers into the internet page. Then after you do all that you have to print it out, mail it in, and wait 10 weeks for the rebate. No printer? Sorry, you're s*** out of luck and have to do it all again when you are near a printer. It'll save you a bunch of time to just write down all the info needed on a peice of paper if you actually go through the process.