I have a 99 Legacy, Over the winter I replaced the exhaust manifolds, I had to remove the heads and cut off the manifolds on the bench. (not a fun job). After reassembling everything my gauges went Haywire. I'm thinking it's a ground issue but I can't find it. This weekend I went through the harness on the back of the head and cleaned and checked everything. I pulled the computer and there was no sign of water or broken o-rings either. (this is my 4th computer so I know where to look) and the boat hasn't been in the water since the head rebuild.
The tach points straight down to 6 oclock, the temp gauge is pegged as well as the fuel, the alt and oil pressure seem to work ok. Any ideas? Does anyone have a wiring diagram?
thanks