I have an Auto Meter, Pyro gage on my 01. Been on about 2 years. All of a sudden I'm getting false readings on the gage. It will go from 2 to 10 then fall back then back up etc. This happens wheather I'm working it or not. bought a new probe, dont seem to make any difference. Got to be the gage I presume, however everyone tells me its generally the probe. Any ideas on how I can check and see if its the gage before I go plop down $#@$%!#@$%! 175 for a new one?