I agree its not a J&S product, but back in 2009 before John offered the dual knock retard/knock finder gauge I planned on buying the Safeguard and gauge but I also wanted to know what cylinders were knocking. I intended to turn the useless cubby hole above my radio into an LED display so I would be able to see what cylinder were experiencing detonation. John and I discussed my intentions extensively and he was willing to provide me with eveything needed but I ended up selling Belle. When I bought her back I was estatic to see that he started making the dual gauge because its such a great gauge.I doubt that is J&S. John would never allow that shoddy work out of his shop.