TrackIR Settings

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TrackIR Interface
BEFORE using the interface you MUST 'Check For Game Updates' within your TrackIR5 and ensure OpusFSX is listed in Titles under the Advanced Settings tab, then restart TrackIR.
Prior to using the TrackIR5 device via OpusFSX you must ensure TrackIR5 does not directly connect to the FSX/P3D simulator. To accomplish this you MUST rename the two SimConnect manifest files within the TrackIR5 installation folder. The folder is usually located in either,
       c:\Program Files\NaturalPoint\TrackIR5            (Win 7 32-bit)
or,   c:\Program Files (x86)\NaturalPoint\TrackIR5   (Win 7 64-bit)
BEFORE using the OpusFSX TrackIR5 interface you MUST rename the two manifest files, simconnect.manifest and simconnectSP2.manifest. We recommend renaming these files to simconnect_RENAMED.manifest and simconnectSP2_RENAMED.manifest. If you wish to revert back to using TrackIR without the OpusFSX interface then you will have to change these files back to their original names. 
Check your TIR manifest files after any TIR update, the TIR software can create new files after the upgrade.

Do not copy SimConnect.dll to your root directory otherwise TrackIR will find it and connect directly to FSX instead of OpusFSX.
Run TrackIR and FSX before running OpusFSX. Minimise the TrackIR program to prevent FPS loss.
Ensure you have no other software packages running that create camera shake effects. Do not run any other program which controls the camera views or interfaces to TrackIR. Make sure no such program or subordinate task is running, do not allow any other program to connect to TrackIR prior to OpusFSX.
TrackIR 
Tuning
TrackIR effects must be tuned using the TrackIR program. TrackIR can be used with the default TrackClip, or it can be used with TrackClipPro. TrackClipPro has its own LED emitters and its setup is very different from TrackClip, refer to the TrackClip and TrackClipPro sections below.Make sure you have Video Processing Mode set to Precision or Standard with a Precision Mode Smoothing of 100. It has been brought to our attention that on some systems TrackIR can become very jerky if 'precision' is disabled, its default key assignment is F7 so it's possible to inadvertently change its setting if you use F7 to increase flaps.
TrackClip

We would advise initially setting the Speed to 1 and the Smoothness to 50. You should experiment on your system and set values your PC is happy with to avoid any jerky DHM movements. Use the test options within the DHM dialog to see what the DHM should look like on your system, then try taxiing up and down in windowed mode and adjust your TrackIR smoothness to give you the optimum effect. 
Make sure your Light Filter Threshold isn't set too high, try setting 70, and adjusting from there, with a max setting of 12 for your IR Brightness. Light pollution and an incorrect Light Filter Threshold setting are the number one main causes of flicker. 
TrackClipPro 
It has been reported (thanks Barry and Neil) that for TrackClipPro the Camera IR brightness should be zero and Light Filter Threshold should be set to a high value. The easiest way to get the correct settings is to click the TrackClipPro button in the TrackIR window and it will reset the Camera settings automatically. 

Troubleshooting

TrackIR Flickering or Erratic Movement
Problems arise when the light threshold is wrong. If it is too low, extraneous lightsources in the room will falsely trigger TIR into seeing that other lightsource as one of the TrackClipPro's beams. This causes all kinds of false head-rotation issues, which show up as flickering. The easiest way to solve the problem is to go into the TrackIR main view, right-click on the head-graph window, and choose Camera View, and then tweak the Light Threshold to a point where there is NO red 'false lightsources' visible anywhere during the full range of head movement. This can even change during the course of a day (depending on the intensity of reflected light from windows, eye glasses, items in the room etc.).
Your IR brightness levels should be zero. Try selecting the old Trackclip momentarily and then re-select TrackClipPro, and this should clear the IR settings back to zero (off). The TrackClipPro does NOT require the camera to send out IR signals (which are normally reflected off the front of the old Trackclip for the camera to pick up). Instead, the TrackClipPro generates its own light beams directly (that's why it's connected by wire and powered) - but of course, the camera can still get confused if there are large alternate light sources in the room competing with it.
Here is a handy little tip for fixing TrackIR jerkiness (reported by fiftysix), http://airdailyx.blogspot.co.uk/2012/09/spf100-track-ir-adx-tutorial.html
Make sure you don't have any monitoring programs (e.g. FSUIPC autosave) running since they can cause TrackIR to become jerky.
Try enabling the Run TrackIR High Priority option in the Server Configuration dialog if TrackIR is not operating smoothly. You may need to try different versions of the TrackIR drivers to get it working smoothly on your system.
TrackIR will not Connect to OpusFSX
If you update the TrackIR software remember to rename the two SimConnect manifest files within the TrackIR5 installation folder. 
Search your system and make sure there are no more manifest files located anywhere. Check your root directory and in fact search the entire PC for them. If TIR finds any manifest file it will not attempt to connect to Opus or anything else apart from the sim direct.
Try running everything manually and don't use any automated method. Run TrackIR manually after FSX, then finally run FSXSERVER, in other words do not run TrackIR and FSXSERVER automatically via FSX or FSUIPC. 
OpusFSX TrackIR Settings

Within OpusFSX set the TrackIR scan speed to 25 initially, the XYZ scaling to 1 and PBY scaling to 0.75. These can be adjusted on the fly from within the Configuration dialog. 

The TrackIR scan speed can be altered from 1ms to 60ms. If TrackIR is 
jerky then adjust this setting (try 25-30) in conjunction with your TIR device 
Speed and Smoothness settings to reach an optimum effect. If you set the scan 
rate too high it stutters, if you set it too low it jumps. 

The PBY setting should be adjusted in conjunction with the TIR device speed settings to determine the range of head movement and how far you can see behind you.

The TrackIR interface can be toggled on/off within the Cameras dialog (Toggle TrackIR On/Off button), allowing camera configuration and editing with the TrackIR device either on or off. 

TrackIR 
        Operation

        TrackIR can be 
        enabled or disabled for each camera view within Live Camera, this is 
        useful for instance when you want to adjust the GPS via a small click 
        spot, if TrackIR (and DHM) movement is frozen you can operate the click 
        spot no matter how unsteady your head is.
        The TrackIR interface can be 
        toggled on/off within the Cameras dialog (Toggle TrackIR On/Off button), 
        allowing camera configuration and editing with the TrackIR device either 
        on or off. 

TrackIR Cockpit Limits 

        To
        set up TrackIR cockpit limits refer to the OpusFSX_Live_Camera guide.
N.B. Check your TIR manifest files after any TIR update, the TIR software can create new files after the upgrade which you will need to rename again (see above for details).