As long as you know what pin is what on that cable you have so you can match ot to the 9 pin serial.
The attached picture is what those wires should connect to on the tracker
Hopefully this helps, also I assume you have the power docking cradle for the 7200 as well. I have  that and I just use the pre made cable with serial and mini usb that is available.
Once you have thr cable made up and everything connected amd the tracker settings set correctly you should be good to go and it will start up on power up on the fleet mode
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-------- Original message --------
From: "***@dundee.net [tracker2]" <***@yahoogroups.com>
Date:11/27/2015 12:49 AM (GMT-05:00)
To: ***@yahoogroups.com
Subject: [tracker2] Garmin FMI cable wiring?
Attempting to get FMI working on my Garmin 7200. I found the correct cable - Mini-USB on GPS end, bare pigtail on the Tracker end. Does anyone know which leads go to which DB-9 pins?
Thnx
W8WDR