Originally designed for the FC RX-7, the Zeal Engineering Daughterboard is a versatile expansion board created by Ken Culver, one of the lead developers of the MS2/Extra and MS3 firmware. Now available in kit form, this board adds advanced input and output capabilities to your MegaSquirt ECU and has been successfully used across a wide range of vehicle applications.

Key Features:

• Dual VR conditioners – Built using LM1815 adaptive circuitry, ideal for crank/cam signal processing

• Three general-purpose digital outputs – Each rated for up to 1 amp

• One high-current PWM output – Capable of handling up to 3 amps, perfect for boost or idle control

• 12V tach output driver – Suitable for first-gen RX-7 tachometers and many other vintage applications

Compatibility:

• Works with MS1/Extra and MS2/Extra firmware

• Compatible with V2.2, V3.0, and V3.57 MegaSquirt mainboards

This board is a great choice for those looking to expand their ECU’s capability with VR signal processing, PWM control, and additional outputs—all in a compact, DIY-friendly package.