507 AP Panel
Hey Ken... When I was upgrading my -8A I put the 507 on the bottom left of the panel because I had a hole where a radio came out. I wasn't sure I would like it there, but it actually really good! Of course the throttle quadrant is on the left and your's wont be, but it seems to be the perfect location. I'll send you a pic when I get back home on 1 March.
Bill VonDane (BVD)
RV-8A - Elbert, CO
www.eHangar.org - Free Online Panel Designer