You might want to call Kramer Auto. I bought might from them about 5 years ago and still reads good. At that time, they recalibrated and made sure it worked before shipping it out. You have to call them because some of the sending units are not listed. http://www.kramerauto.com
I've dealt with Jim Kramer many times, I actually bought my 'Cuda from him. He's a great guy and honest, but it seems a little hard to get in touch with him lately.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
