I don't have that plane, so I can't test it ...
You can edit the Sim2bHap.ini, and add the P47, you can use the P51 as base, copy/paste, rename, and change the max speed.
The *Threshold parameters, you can change them also to your taste, if you want the vibration to start sooner or later.
If you put several * before the name, it will be the first one in the list.
[***DCS_P-47]
activeSim = DCS
speedThreshold = 75
rpmThreshold = 98
maxSpeed = ???