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Shootout

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  1. #1
    10 Second N/A Club


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    Offline
    Join Date
    Sep 2008
    Name
    Josh
    Vehicle
    96 Z28
    Location
    Holden, MO (KC)
    Posts
    2,831

    Default Cluster not working

    So when I switched to Holley EFI I left the stock PCM in the car so the gauge cluster would still work (except the tach). At the last LTX Shootout I removed the PCM to let someone use it and to my surprise all my gauges except the speedo still worked. This year I removed the remaining PCM connectors to clean up the engine bay and removed some of the wires and relays in the under hood fuse/relay box. Well now my gauges don't work. All my fuses are good, car runs fine, cluster back lights work and check gauges light illuminates but no life in the gauge needles. Looking at diagrams I can't find where I would have cut the wrong wires but obviously I did something! Any advise?
    -Josh
    co-owner of BDBRacing.com
    NMCA OC 9004
    96, N/A 385, Holley EFI, Faceplated M6, AI TFS heads, LE SR cam, MWC Fab 9
    10.68 @ 129 1.57 60'........still workin on that 60' shootin for 1.4's!

  2. #2
    10 Second N/A Club


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Josh
    Vehicle
    96 Z28
    Location
    Holden, MO (KC)
    Posts
    2,831

    Default

    *UPDATE* It was a ground for the cluster itself I had accidentally cut when removing several wires from the sealed firewall connector near the master cylinder. So FYI the oil, fuel, coolant temp and volt gauges will work without the PCM in the car as long as the cluster has power and ground.
    -Josh
    co-owner of BDBRacing.com
    NMCA OC 9004
    96, N/A 385, Holley EFI, Faceplated M6, AI TFS heads, LE SR cam, MWC Fab 9
    10.68 @ 129 1.57 60'........still workin on that 60' shootin for 1.4's!

  3. #3
    LTx Guru


    Status
    Online
    Join Date
    Apr 2013
    Vehicle
    1994 Formula
    Location
    Central NJ
    Posts
    1,778

    Default

    Correct.... only the tach and speedo are driven by the PCM.

    94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams solid roller / TH400+GearVendors OD / 4.11's/Strange 12-bolt / 300-shot (dry) N2O / Spohn Suspension / 6-pt roll bar /AutoMeter instrumentation / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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