Firstly a forward: X-wing largely pays homage to the x-wing and TIE fighter videogames, as well as the OT Movies. Ships such as the TIE Defender and the TIE Phantom had their initial appearances in the video games (TIE Fighter and Rebel Assault 2 respectively). The Defender went on to make appearances in Games Star Wars Rebellion (Supremacy in the UK) and both the Defender and Phantom made appearances in Empire at war.
One ship that made it's first appearance in X-wing, and then TIE Fighter was the Starwing Assault gunboat. Basically a versatile hyperspace able Imperial ship. This is great! A Ship that moves a little away from the carrier dependent TIE Corps.
The Stats I would propose are as such:
Firepower 2: 2 Laser cannons.
Agility 2 (possibly 1). The Gunboat is more agile than a B or Y wing, yet a little less so than an X-wing. It is however a larger target than the X.
Shields 4: Slightly less shielded than a B.
Hull 3 (possibly 4). The gunboat was a flying tank.
The ship would be capable of Target lock and Focus. I can't justify Barrel roll or Evade. It did not have a cloaking device.
As for the Dial, something that looks like the Y and B-wing is really what's wanted. It's not as fast as an X, faster than a Y.
It would have to have a cannon upgrade, and additionally 2 missile slots, or one missile 1 torpedo. The Gunboat was more often armed with concussion missiles as the standard weapon. in games later than X-wing the ship was used for more of a bomber role escorted by TIE Advanced, but in X-wing it was largely a missile platform.
I would also give this ship a system upgrade.
For Fluff reasons this ship would make an amazing addon to the range, allowing imperial's to field tough long range Recon ships independent of any carrier support. The Gunboat is capable of long range patrol and Recon as well as able of getting into the thick of it.
For Game reasons, it's a tough heavy missile platform capable of toting a cannon, mixing an average agility of 2 (possibly) while maintaining high hitpoints.
Who knows. Maybe it could come with advanced concussion missile cards...

