Cumminspwrz:
If I remember right the last issue of TDR had just what you ar asking as a test. I talked with Robert sat. at a SETDR gathering at Geno's and that was brought up. He said they all seem to have the same results. I put the Pro-Comp in mine just for piece of mind. According to the artical, the probe hardly ever goes bad. I talked to a big truck mech that told me he has a bucket full of the probes.
Keep it till it quits.
. . Preston. .