Joe's top tip for FBH longevity
 

Glue up the seam of your FBH CPU box. Use UHU or the like. After reading loads about these things I think many dead FBH CPU's are caused by water ingress. Steam cleaning 75 engine bay near FBH may also cause FBH failure. Glued mine up a year ago. My FBH works nicely. For diesels it's a must have extra.