Five years later I want to point out that I really badly screwed up the 13W3 pinout and never saw sgifanatic's suggestion to fix that.
The one several posts above applies to other machines like the Onyx or Octane which use almost none of the extra pins on the 13W3 connector. Indy Newport Graphics however are a lot more monitor friendly and also supply a horizontal and vertical sync. The pinout is listed on page 201 of the Indy Owners guide but here's the proper wiring chart.
Code:
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13W3 VGA
1 (Monitor Type 3) ------------------------- 15 (ID Bit 3)
2 (Monitor Type 0) ------------------------- 11 (ID Bit 0)
3 (Composite Sync) ------------------------- N/C
4 (Horiz. Sync) ---------------------------- 13 (Horiz. Sync)
5 (Vert. Sync) ----------------------------- 14 (Vert. Sync)
6 (Monitor Type 1) ------------------------- 12 (ID Bit 1)
7 (Monitor Type 2 -------------------------- 4 (ID Bit 2)
8 (Ground) --------------------------------- 6 (Red Shield)
9 (Ground)---------------------------------- 7 (Green Shield)
10 (Ground) -------------------------------- 8 (Blue Shield)
A1 (Red) ----------------------------------- 1 (Red)
A2 (Green) --------------------------------- 2 (Green)
A3 (Blue) ---------------------------------- 3 (Blue)
9 (Ground)* -------------------------------- 5 (Ground)
N/C ---------------------------------------- 9 (KEY/DDC +5v)
*All grounds are common, so it doesn't matter if you use pin 8, 9 or 10.