Just wanted to thank the OP for the idea to use the new Stern autoplunger on TOMMY.
I purchased the following parts:
Autolaunch kicker assembly 500-6091-00
Coil - DE/Sega/Stern 090-5023-0B
Transistor TIP36C 5194-12179-00 (this predriver blew when the coil I had in my old autoplunger caused a fuse to blow)
six - #6 screws (like the ones all over the rest of the underside of the playfield)
This is a bit of work and took me 3 hours so I figured while its fresh in my mind I would write down instructions for someone else.
You have to remove the whole assembly (you only have to unsolder the lugs on the coil, the switch can be removed without disconnecting. Remove the screws on the switch base. Remove the coil base from the flat bracket.
Next, mount the switch directly to the underplayfield. If you have a later stern model available you can see how far back you need to mount it. Remove the small bracket on the switch and reverse it so you mount it on the left side of the shooter groove. (if you don't do this the plunging mech will hit it. The right angled wire of the switch should be about 10mm from the edge. Ensure you can move the switch freely when mounted.
Then assemble the kicker, bracket and coil as one unit. You will need to hold this up to the underside of the playfield and with a pencil
and your other hand mark the mounting holes once its all aligned up and the plunger moves freely and the kicker prongs don't hit the playfield. align the prongs with the center groove.
Now mount the kicker assembly in the mounting holes you made. I didn't need a drill, just had to push hard on the screws with my driver.
Then mount the coil/bracket in the mounting holes you made.
Reconnect the wires to the coil and enjoy.
If you blew a fuse because of your autoplunger, it probably took the pre-driver with it (like mine did). The pre-driver is Q5 and its on the power board. remove the board, desolder the transistor, install the new transistor, replace the 4a slow blow fuse and enjoy!