File το DOWNLOAD and install is ilhtcas4.zip found in popular file libraries.
Documents included should be read for installation.

My changes to -200 model panel.cfg for CS727 ver2.6

[Window04]

//gauge02=..\..\CS_B727-100\panel\Captain_Sim.p721.P13!P13_001_tcas, 0,266,184,109
gauge02=ILH_TCAS!Transponder, 0,380,349,155


[VCockpit01]

//gauge07=..\..\CS_B727-100\panel\Captain_Sim.p721.L11!L11_vsi, 20,524, 217,220
gauge07=ILH_TCAS!IVSI, 16,520, 219, 222

(last one, number 41 due to CIVA INS setup)
gauge41=ILH_TCAS!Logic, 0, 0, 1, 1, trafficinfo:yes volume:-100


[VCockpit07]

//gauge05=..\..\CS_B727-100\panel\Captain_Sim.p721.R11!R11_vsi, 20,524, 217,220
gauge05=ILH_TCAS!IVSI, 12, 516, 219, 222

Screenshots of how it looks:
http://hellasga.com/gallery/kyp/fs/fsx/cs727/tcas_wx
http://hellasga.com/gallery/kyp/fs/fsx/cs727/tcas2

It was more than 10 years ago when I did the same for the DF727  :)
http://www.flightsim.com/vbfs/showthread.php?150838-DF727-panel-ILH-TCAS-and-Transponder-for-on-line-flights