Be careful with the Midway Dauntless. SBD-2s flew from Midway Island. I believe all the carrier aircraft (Yorktown, Enterprise and Hornet) were SBD-3s, modified after Coral Sea in early May of 1942 with dual .30 cal guns and fairly large national insignia with no red ball in the center and no red and white stripes on the rudder. It looks like you have the correct AM release to do one. Based on photos of actual aircraft at Midway most of them had insignia that translate into 1 and 1/8 inches diameter for 1/48 scale rather than the 1 inch on all the decal sheets. I have only been able to find this size in one aftermarket sheet, for an early P-47 (cant remember the sheet mfr.) The insignia were carried in six positions. Of course at this time the markings were a sort of mish-mash, with nothing being actually "standard". I have the AM SBD-3 from Coral Sea, but like I said things changed between then and Midway and the placement guide is probably not accurate for the larger insignia.
This link has some photos that might help:
http://hsfeatures.com/features04/sbd3jv_1.htm
Note that I believe the national insignia are too small on this example.
Hopefully someone else can post the placement guide for your kit.
Two of the world's greatest questions:
Why can you not get after-market 1/48 SBD-3 markings for Midway, one of the most important battles in world history?
and;
Why can you not get a 1/700 or 1/350 OOB CV6 Enterprise, the greatest ship in US Naval history, from the same battle?
It has to be a conspiracy.
Anyway, Good luck.