The RPM Window Switch has two adjustable RPM points — one activates a circuit, the other deactivates it. It supplies then removes ground to a circuit, which is useful for shutting off nitrous before the engine's rev limit is reached. It works with stock inductive ignitions or an MSD ignition and handles up to 1.5 amps; RPM modules are sold separately.
Specifications:
- Brand: MSD
- Category: Air and Fuel Delivery
- Product Type: RPM Switch
- Sub Category: Fuel Injection System and Related Components
- Warning: California Proposition 65
- Warranty: Manufacturer's Limited 1 Year Warranty
- Part Number: 8956
FAQ
What does the MSD 8956 RPM Window Switch do?
It activates a circuit at one RPM point and deactivates it at another, supplying then removing ground.
What's a common use for the 8956?
Deactivating nitrous before the engine's rev limit is reached.
How much current can the 8956 handle?
Up to 1.5 amps.

