Product review (5 stars): Hack a temporary fix while waiting for new part.
Installation of this part is easy if you carefully have removed the old one or have the schematic from the dryer. The way you wire it up depends on the options your dryer has so be sure to pay attention to wire position when you remove the old timer.

It is an OEM part that works on many models of Whirlpool made dryers.

What I did was to get the old timer to limp along for a bit longer after it had initially failed.

To disassemble the old timer:

1 Mark the position of the shaft where it comes out of the metal plate.

2 Remove the two Phillips screws holding the front metal plate to the plastic box. (No need to remove the motor.)

3 GENTLY grab the shaft and slowly pull on the shaft while giving it some wiggle and twist action. Pull too hard and you will mangle the works.

4 You can usually see that one set of contacts have burned up. (The usual suspect are the contacts nearest the motor.)

5  Clean the bad contacts a bit with a small file or sand paper on a popsicle stick. Q-tips help.

Reassembly requires you to gently wiggle as you coax the cams past the four sets of contacts.  When the metal plate sits flush against the plastic box you can reinstall the screws.

This is only a short term fix, but it might give you a couple of weeks so you don't have to lug laundry to the laundromat or have a huge pile of laundry to deal with while you wait for the new one.