# MSD 8491 - Tach Drive Adapters

The standard tach drive for MSD tach drive distributors is a 3/16 In. tang drive cable. In most cases this type of drive will work, but for those who require the 0.104 In. square drive (Corvette style), MSD offers a tang to square drive adapter to fit all MSD tach drive distributor assemblies.

Key Features:

-   Tach Drive Adapter

-   Tang To Square Drive

The MSD team has a strong core of excellent engineers, technicians, assembly specialists who design, develop and manufacture a wide variety of products, including Ignition Controls, Coils, Timing Accessories and Spark Plug Wires and Accessories. All MSD products feature the finest ignition components anyone can install on their vehicle and are geared towards all auto enthusiasts!

### Vehicle Fitment

| Year | Make | Model | Position | Fitment Precision | Note |
| --- | --- | --- | --- | --- | --- |
| All | All | All |     |     |     |

### FAQ

**What part number is this?**  
The listed part number is 8491.

**Should I confirm product specifications before ordering?**  
Yes. Compare the original product specifications and application details with the supplied information.

### Common Searches

-   MSD Ignition 8491
-   8491 specifications
-   MSD Ignition MSD 8491 - Tach Drive Adapters
-   8491 automotive replacement

## Details

- **Price:** 94.71 CAD
- **Vendor:** MSD Ignition
- **Type:** MSD 8491 - Tach Drive Adapters
- **Tags:** 8491, Automotive Performance, MSD 8491 - Tach Drive Adapters, MSD Ignition

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 94.71 CAD | In stock |

## Images

- MSD 8491 - Tach Drive Adapters

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/msd-ignition-8491-msd-8491-tach-drive-adapters)
> Updated: 2026-10-30