I have a 1999 90hp evinrude ficht bought new when i rtetired. Engine runs flawless all these yrs but not the water indicator (wee hole ) not streaming and sprays instead. I thought water pump and removed water indicator plug and back flushed,, engine sprayed water gggreat,, rechecked and found the plastic tube where the indicator plug inserts into is cracked and therefore cannot tighten plug completely. anyone know how to replace this plug and tube setup ?? thanks alot.. John Perry, Wisconsin