I would send it back. I work hard for my money, It's not going to go away,and you will see it everytime you look at the dash.
While that sounds like the best option, if it is a mark produced by a manufacturing process, my only other option would be some ghetto plywood mount to hold the gauges. As mentioned earlier, if this is the best they can do, I'll live with it.
I just wish they could have put the jig at the top of the hole where it is less visible.
I'm glad people demand Mustang parts without flaws or I might be driving a complete can of worms...
In the last 2 years alone...
I am on my 3rd reproduction gas cap due to venting issues, 2nd white stripe reproduction heater hose due to the last being slightly oversized, 2nd reproduction brass float sender due to incorrect readings near the empty, I scrapped a set of new Concours spark plug wires since they were bad (Mustangs Unlimited wouldn't take a return on them since they were an electrical item), My reproduction shifter wouldn't accept trunnions out of the box since it was produced out of spec (had to use a dremil on it), My weatherstripping uses metric nuts!, GT reproduction exhaust H-pipe was produced out of spec, and I could go on...
This is a great example why as customers/consumers we should demand higher quality.
When a completed restoration is made up of 75% reproduction parts, you're adding a lot of potential roadside breakdowns and work to be done after one thinks he is done with his project.
It's the "stacking" effect. You keep stacking these flaws and ignoring them, you're going to discover you just built a pretty POS to bite you in the butt later.
Granted, mine is a cosmetic issue, but if you don't think there's not a functionality flaw being sold out there, you are in for a big surprise. I consider myself lucky with my experience and skills to be able to see a part with flaws, be it cosmetic or functionality so I can correct it during the build.
I may be a PMS'n old lady now, but at least I won't be on the side of the road or in a parking lot at a car show whining and bitching in the hot sun about one of many flaws that someone found acceptable during the rebuild.
Not sure if any of you remember Oswalt's Mustangs, but he was a vendor/dealer that retired about the time I bought my project 13 years ago. He was the go to guy in SC for parts, and I had a nice long phone conversation with him why this was.
He knew which aftermarket parts were junk, which to buy and how to fix those where there were no options. He turned out some really nice cars in his years in the business.