All ActivityMost RecentMost LikesSolutionsRe: SilverLeaf Engine Monitor (still good)Thanks for the replies the model on the box is; VMSpc JR500 J1708 Interface Board V. 2.01 It has a grey 6 pin plug and also a black 8 pin plug which is what I was using.SilverLeaf Engine Monitor (still good)We have been out of RVing since early 2007, my wife was sad when the Allegro Bus left the drive. During a recent move I came across our SilverLeaf engine monitor setup and wanted to know if these have a lifespan, is it worth trying to sell, or should I pitch it?