Yes, if there isn't already a dual contact switch somewhere, you can replace a single with a double. Even then that can get pretty expensive (single leaf switches are pricey as it is)
http://www.pinballlife.com/index.php?p=product&id=152

that's why many opt to build their own separate cherry switch with an arm, because cherry switches are very cheap (as low as a buck)

True, $8-10 a switch can be pricy when trying to do an entire game.

I'd only make this suggestion for an application such as Chosen_S was asking about where he only wants to be able to start and stop background music.

Took what I learned from here and modded my 1980 Gottlieb Amazing Spiderman. Kind of tedious but I had a lot of fun figuring it out.

That is the most amazing Spiderman I've ever seen Very nice work on the playfield. Backglass looks great too- who did the repro for you?

that is great, real nice work

Thanks for the kudos. Vid's playfield restoration thread helped me immensely. Shay did the incredible work on the reproduction ASM backglass and the youtube video doesn't do it justice: http://shayarcadegroup.com/

Need a little help determining what kind of switches I need to order.

I want to install sound on a Hollywood heat at the ball drain switch where it can play music on ball drain and during attract and end of game. I think I need to order a double switch with one contact but not sure what one exactly?

Also, if I wanted to add sounds at the in/outlanes what type of switch would you recommend to piggyback with?

I'm using two MP3 triggers, one for soundtrack triggered by switch in shooter lane and the second is for sounds/callouts.

Thanks for the help!