i am trying to find a DB9-15p monitor signal input connector for a 
mitsubisshi diamond pro 900u

can not find one any suggestions

Hi!

I don't think you need to build a cable.

According to your manual, the monitor has a standard 15-pin connection on the back:
http://www.necmitsubishi.com/corpus/N/L/DPro900_manual.pdf

Although the manual refers to a DB9-15P cable, the standard cable
would be DB15-DB15. Here are some options:

(a 9-15 would be to connect a very old computer)

http://www.startech.com/ststore/itemlist.cfm?category=C30200&topbar=topbarc.htm

http://catalog.belkin.com/IWCatSectionView.process?IWAction=Load&Merchant_Id=&Section_Id=16

http://www.cablesbyacc.com/catalog3lvl.cfm?product=ACMVGA&category=Video%20Cables

You should need a male to male cable.

Thanks for asking!
sparky4ca-ga

It's a standard Canon D-Sub High Density 15 pin connector.  There are
many varieties in mount style, wiring style, and overall quality.

Check this Allied catalog page for a list of some.

http://www.alliedelec.com/catalog/pf.asp?FN=116.pdf

Part 512-0252 is the connector on most monitor cables.  You'll need
the pins to insert into the connector.

For a simple route you can buy them from Radio Shack part # 276-1501
for $1.89 at www.radioshack.com

-
natch