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Large-Face Mushroom Button Twin Plate for Custom Racing Switch Panels
The Granatelli GMS789464T is a mushroom twin switch plate that accepts two large-face mushroom .635-inch barrel-style switch buttons arranged side by side. The mushroom button profile provides a wider, more tactile actuation surface compared to standard face buttons, making it easier to locate and operate switches by feel while wearing gloves or under the physical demands of track driving. Compatible with the Granatelli 10-inch D-shaped racing steering wheel switch panel and any housing that accepts .635-inch barrel switches. Switches and the steering wheel are sold separately.
Key Features
- Mushroom Button Format: Large-face mushroom profile provides a wider, more tactile actuation surface for gloved or high-stress driving environments
- Dual Side-by-Side Layout: Accepts two .635-inch barrel mushroom switches arranged side by side for independent actuation
- Universal Fit: Compatible with any switch housing or panel that accepts .635-inch barrel-style switches
- Race-Ready Construction: Built to Granatelli's competition-use standards for reliable actuation in demanding environments
Specifications
| Detail | Value |
|---|---|
| Part Number | GMS789464T |
| Brand | Granatelli Motor Sports |
| Switch Button Diameter | .635 in (barrel-style) |
| Button Count | 2 (side by side) |
| Button Style | Large-face mushroom |
| Fit | Universal |
| UPC | N/A |
What's Included
- 1x switch plate
About Granatelli Motor Sports
Granatelli Motor Sports is a California-based performance parts manufacturer with roots in professional motorsport. The company produces ignition systems, interior accessories, and racing components used across drag racing, road racing, and high-performance street builds.
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Frequently Asked Questions
What is the GMS789464T?This is a Granatelli Motor Sports mushroom twin switch plate that accepts two large-face mushroom .635-inch barrel-style push buttons side by side. It is a universal accessory for drivers who prefer a larger, more tactile button surface for switch actuation while wearing gloves or driving at track pace.
What is the difference between mushroom and standard face buttons?Mushroom buttons have a wider, raised dome-shaped cap that extends above the panel surface, providing a larger actuation area and a more positive tactile feel. Standard face buttons sit flat to the panel. Mushroom buttons are generally preferred in racing applications where switches must be located and activated by feel alone.
What is the difference between the Granatelli switch plate options?This plate uses two large-face mushroom buttons side by side. The standard twin (GMS789465T) uses two flat face buttons side by side. The double (GMS789464D) positions one button per side for wider spacing. The single (GMS789464S) accepts one button with 4-position orientation. Choose based on button style and switch count needed.
Is this compatible with the Granatelli 10-inch D-shaped steering wheel?Yes. This plate is designed to be compatible with Granatelli's 10-inch D-shaped racing steering wheel switch panel and any housing that accepts .635-inch barrel-format switches. The steering wheel and switch buttons are sold separately.
What switch buttons are compatible with this plate?This plate accepts .635-inch diameter barrel-style push buttons. Verify your intended switches match this diameter and barrel mounting style before ordering. Switches are sold separately and are not included.
Are switch buttons included?No. This is the mounting plate only. You will need to source compatible .635-inch barrel-style switch buttons to complete the installation.
Can this be used in a street car?Yes. This is a universal accessory and can be installed in any vehicle with a compatible switch panel housing, not exclusive to competition use.
How do I wire the switches after installation?Wire each switch button to the intended circuit per the switch manufacturer's wiring diagram. Ensure each circuit is properly fused. For safety-critical applications such as kill switches or fire suppression, consult a professional installer familiar with competition vehicle wiring standards.
What material is the plate made from?Refer to Granatelli's product documentation for specific material information. The plate is built to Granatelli's race-use standards for durability in demanding competition and street environments.
Installation Instructions
- Verify that your switch housing accepts .635-inch barrel switch buttons and that the plate dimensions match the panel cutout.
- Insert the plate into the panel housing, aligning the button holes with the housing cutouts.
- Seat the .635-inch barrel switch buttons through the plate holes and secure per the switch manufacturer's retention method (clip, nut, or snap-fit).
- Wire each switch button to the intended circuit per the switch manufacturer's wiring diagram; ensure proper fusing on each circuit.
- Confirm all switches actuate freely before securing the panel in the vehicle.
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