[tony_fury]

Not certain if it's the fuel or not, without back tracking to the dash, I would not start with other probable causes.

Water is heavier than fuel and will drop to the bottom of a tank.

This whole symptom started with a simple bulb replacement, which required removing the dash.
There were three connectors that have to be seated and locked into place.
There was another member that did the stalk mod and had a loose dash connector causing weird problems.

I would go back to square one and verify the connectors on the dash are not cocked or loose.
Then see if the problem persist after that.
Then maybe suspect bad fuel or other problems.

Gorthaur:
Until you can positively eliminate the dash connectors as a cause or not, there are too many unknown variables.
It's hard to analyze without elimination.

I see you will get to that on Sunday, let us know your findings.

Thanks
T