To install ClockworkMod Recovery (CWM) for Galaxy Tab P1000, follow these instructions:
1- Reboot your device in download mode (power button + volume down rocker)
2- Open Odin. If you do not have it on your PC, get it from galaxy tab plus official firmware post (see the bottom of the post).
3- Download Skin1980_P1010_CWM-RECOVERY-BETA-1.tar from this thread at XDA and select the file in the PDA field in ODIN;
4- Flash it.
Tip – Make a data backup of your Tab before you proceed.