Although we can't help you find replacement gauges for your K3, P2, M2X, or J2X...we can at least tell you what the correct part numbers are. While rummaging through our magazine archives, we found an original Smiths catalog from 1952! We scanned the Allard pages for your reference...click here to view them. Additionally, while roaming the internet, we found a guide (click here) on how to repair and rebuild your Smiths speedometer...if you're brave.