I am trying to remember what the dash/gauges of a 66 Beau looks like?
Any help?

Here's a picture from one that was on e-Bay in January 2006. It was a 28,000 original mile survivor with a 396 & a 3-speed.

The worn plastic seat covers, suicide knob, aftermarket gauge panel below the dash are obvious additions. I don't know exactly what those floor mats are from but I suspect a full-size U.S. Pontiac (note the fit around the gas pedal). Canadian floor mats had a maple leaf with GM written on it. It is a really neat car and I wish I owned it.

Thanks Cam, exactly what I was looking for. That is how you get a 66 'chevelle' with round gauges!