Quoted from D-Gottlieb:No, that is a must have add on to prevent the slam tilt issue. That issue was power related. If you haven't fitted the capacitor, you should. Stern also warned about using non-Stern shakers, like those from Pinball Life.
When Spike 2 first came out, Pinball Life’s shakers weren’t compatible and fried some boards. Pinball Life quickly corrected the problem (with their Revision C shaker), and paid for everyone’s repairs. I’ve got a Pinball Life shaker in my SW and it works great.