GEAR
I will add a list of the Gear Dennis uses soon! here you can see some pictures of amps and guitars he uses (couldn't find a good Fender Stratocaster picture though)
I know that Dennis uses Mesa Boogie amps,
Gibson and Fender guitars, even that red/yellow Gretsch.
He also uses a Hendrix JD wah occasionally, and also and e-bow for in the verses of Rain down on me.
In interviews he has said that he used a vox AC30 on SGYMI, but I don't know if he uses that when he plays live. I hope to get a message from him soon with details of his rig, for now, enjoy the pics!
My gear:

Guitars:

Ibanez RG1527
Epiphone Les Paul
Vantage acoustic
and a cheap Bass guitar

Amp:

Randall RH100

Effects:

Digitech Whammy, E-bow and the Boss GT6, great pedal!!
I also know that Paul-Jan used a Digitech whammy, but I don't know whether it was the re-issue or the old one.