Triumph Wedge Owners Association
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Fuel Injection 'Looking Glass'
Jim TenCate, Michael Hart

TR8 Fuel Injection Feedback Monitor
Fuelies: Ever wanted to check out your coolant temperature sensor? Simple, just measure its resistance with a Digital MultiMeter (DMM) and compare with the values in the ROM. Not. It's in an impossible-to-reach place and removing the connector (which unfortunately has a locking wire) and then getting the leads of a DMM in there is crazy. Better solution is shown here. It's been dubbed "Looking Glass" because it allows you to measure the various sensors of the fuel injection "looking" through the wiring harness (loom). You simply unplug the ECU, plug this box in, and measure whatever you're interested in. Along with learning your wiring harness is ok, you can measure
​ 
  • coolant (water) temperature
  • the throttle potentiometer (TR8) or switch (TR7)
  • the air flow meter (AFM) air temperature sensor
  • the microswitch inside the air flow meter
  • and the resistance of individual injectors too

Interested in renting it out? You pay shipping both ways (USPS flat rate box) and rental fee is just $10 (which is about what it would cost you to build your own version).


​Triumph Wedge Owners Association (TWOA)
TWOA is an Affiliate Chapter of the Vintage Triumph Register
  • Home
  • About/Join
    • Club Benefits
    • Sample Newsletter
    • Fuel Injection >
      • The TR7 ECU - Bosch
      • The TR8 ECU - Lucas
      • Heated O2 Sensors
      • Inside an FI Tank
      • Noid Test Light
    • Join or Renew Online
    • zzzz Join or Renew Online
    • Join or Renew by Mail
    • Board of Directors
    • Bill Sweeting Remembered >
      • Articles >
        • FASD Technical Specifications
        • Members Only Articles
        • TR7 4-Speed Overdrive Conversion
        • TR8 Cooling Fan Circuit
    • Contact Us
  • Tech/Parts
    • Dealer Documents >
      • Memos
      • Recall Campaigns
      • Technical Service Bulletins >
        • A - Engine
        • B - Electrical
        • C - Body
        • D - Transmission
        • E - Paint
        • Z - Recalls
        • F - Chassis
        • G - Miscellaneous
        • H - Air Conditioning
        • TSB Numbers Decoded
      • Training
      • Service Tools
    • Model Information >
      • Brochures
      • Deciphering The Wedge >
        • Component Serial Numbers
        • Paint and Trim Codes
        • VIN and Component Serial Number Locations
        • VIN Numbers Decoded
      • Labels and Decals
      • TR7 Special Editions >
        • Limited Edition
        • Spider
        • Southern Skies
        • 30th Anniversary Edition
      • TR8 >
        • BL Motorsports: Hurdwell Memo
        • California Air Resources Board Emissions Certifications
      • Wedge Colours
    • Parts Suppliers
    • Cottage Industry Parts
    • TWOA Parts
    • TWOA Tool Rentals >
      • TR7 Head Honcho
      • TR7 Head Honcho in Action
      • Fuel Injection Tools >
        • Gizmo
        • Looking Glass
  • Resources and Services
    • Reproduction Suggestions
    • Cars For Sale
    • Cars Wanted
    • Parts For Sale
    • Parts Wanted
    • Harris Mann Art Prints
    • Mailing List, Forums & Clubs
    • Gems: TR8CCA+WWWedge
    • Tech: Best of the Web
    • Wedge List Files
  • Events
    • Calendar of Upcoming Events
    • 2020 TWOA Virtual Car Show Results
    • Past Event Photos >
      • Britain on the Green 2015
      • The Kastner Cup 2015
      • Triumphest 2014
      • VTR National Convention 2014
      • The Gathering Dobson NC 2013
      • Dobson The Gathering 2012
      • South Central VTR Regional 2012
      • Triumphest 2012
      • Maryland British Car Day 2011
      • Dobson Gathering 2010
      • Roadster Factory 2010
      • British Invasion 2009
      • Roadster Factory 2009
    • VTR National Awards History
  • Members
    • Newsletters
    • TWOA Parts Store
    • Sun Visor Information
    • Regalia
    • Official TWOA Documents
    • TWOA Poster
    • FI hose replacement
    • FASD Photos
    • Rear End Spring Experiment
    • Bushing Tests
    • Bushing Buddy - Installation Tool
    • Odd's Engine Removal Tools