Description
⚠️ RACE USE ONLY: Not legal for sale or use in California or on any pollution-controlled vehicles.
M8FI / TCFI G8 / G9 ECU Service Kit – For Shop Installers and Tuners
Daytona Twin Tec designed this service kit for shops that install and tune our M8FI and TCFI G8/G9 integrated racing ECUs. It keeps the most commonly needed diagnostic and replacement components on your bench. As a result, your shop installs faster, diagnoses quicker, and avoids costly delays waiting on parts.
Need to swap a wideband sensor? Check RPM on the dyno without touching the factory harness? Chase a damaged O2 bung thread? This kit covers all of it in one package.
What’s Included in the M8FI / TCFI G8 / G9 ECU Service Kit
- 🔬 2 – Replacement Wideband Bosch LSU 4.2 O2 Sensors — Direct replacements for front and rear cylinder wideband sensors on all M8FI and TCFI G8/G9 equipped bikes.
- 🔌 1 – 10ft USB-C 90° to USB-C Straight Cable — The longer cable gives your technician comfortable laptop placement during dyno runs and bench programming sessions.
- 🔌 1 – USB-C to USB-A Adapter — Connects to any laptop or PC with a standard USB-A port. Works with our PC Link software.
- 🔩 4 – M8 Spark Plugs — Fresh plugs for Milwaukee-Eight engines. Install these during ECU commissioning for a clean baseline tune.
- 📡 1 – Dyno RPM Adapter for 2017-2024 M8 Touring — Picks up RPM signal on the dyno. Clips in without cutting or damaging the factory harness.
- 📡 1 – Dyno RPM Adapter for 2018-2025 M8 Softail — Same non-invasive RPM pickup for Softail platform bikes. No harness modifications needed.
- 🔧 1 – M18x1.5 O2 Sensor Bung Tap — Cleans and repairs damaged O2 bung threads before sensor installation. Saves time and protects your new sensors on problem installs.
Who Should Buy This Kit?
Professional installers and tuners working regularly with Daytona Twin Tec M8FI and TCFI G8/G9 systems will get the most out of this kit. It is a shop supply item — not a typical end-user purchase. Stock your install bay once and stop scrambling for parts mid-job.
Compatible ECU Systems
- M8FI G8 — 2017-2020 Milwaukee-Eight applications
- M8FI G9 — 2021-2024 Milwaukee-Eight applications
- TCFI G8 — 2014-2016 Twin Cam Touring applications






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