Discription says use with external resistor, on Standard's website they say not to use with external resistor. Which is it ?

I have been using mine on a 12v electronic ignition system (1931 Ford conversion) for at least 2 years without an external resistor. No issues.

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Standard Motor Products UC15 Ignition Coil Assorted , One Size

Product ID: 12625305

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Details

Brand
Standard Motor
Item dimensions L x W x H
3 x 3 x 8
Vehicle Service Type
Car
Item Weight
1.2 Pounds
Connector Gender
male

⚡12-volt power boost

🔧Universal screw-in/bolt-on fit

🚗Optimized for car performance

Description

⚡ Ignite your engine’s potential with Standard Motor Products UC15!

BUILT TO LAST - Machined exterior and durable construction ensure long-lasting reliability under the hood.
PERFORMANCE UPGRADE - Designed to work with external resistors to improve overall ignition efficiency and throttle response.
POWER UP YOUR DRIVE - 12-volt ignition coil delivers consistent, high-voltage spark for peak engine performance.
LIGHTWEIGHT COMPACT - At just 1.2 pounds and 3x3x8 inches, it fits seamlessly without adding bulk.
EFFORTLESS INSTALLATION - Universal fit with screw-in or bolt-on design means no hassle, just plug and play.

The Standard Motor Products UC15 Ignition Coil is a universal 12-volt automotive coil designed for easy screw-in or bolt-on installation. With a durable machined exterior and lightweight design, it enhances ignition performance by working with external resistors to deliver a reliable, high-voltage spark that improves overall engine efficiency.

Specifications

Brand	Standard Motor Products
Item dimensions L x W x H	3 x 3 x 8 inches
Vehicle Service Type	Car
Item Weight	1.2 Pounds
Connector Gender	male
Installation Type	Screw-In or Bolt-On
Manufacturer	Standard Motor Products
UPC	091769032708
Automotive Fit Type	Universal Fit
OEM Part Number	UC-15
Global Trade Identification Number	00091769032708
Model	UC-15
Item Weight	1.2 pounds
Product Dimensions	3 x 3 x 8 inches
Item model number	UC-15
Exterior	Machined
Manufacturer Part Number	UC-15

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