Contact us for currrent availability Please Read Before Ordering Instruments... When ordering replacement reconditioned gauges, please state the model required and whether any conversion is necessary. The easiest way to identify your gauge is to refer to the numbers located on the dial face. These 'Smith's numbers are specific to the individual instrument, and are the most reliable method of identification. You will find that the part numbers listed correlate to those found on your gauge. Make a note of this information and provide it when ordering replacement gauges.