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  1. #1

    Question Installing A Fuel Pressure Gauge - What Size Is The Fuel Rail "Test Port" Fitting?


    I want to install an electronic fuel pressure sensor/sending unit onto the fuel rail "test port" at the back of my stock LT1 fuel rail.

    First question, what size and type is that male fitting on the rail? It looks like it might be something like a -4AN fitting, but .... I'm not totally sure.

    Second question, where can I find an adapter, maybe something like a female 1/8"-27 NPT, (needed on the sensor/sending unit side) to a female -4AN (???) on the male test port side???

    TIA for any replies.

  2. #2
    Xtreme Member


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    go on nitrous outlet website, look under system parts. they sell a pressure tap piece that has a gauge port tap 1/8" and a shrader tap. just plug one you dont use.

    https://nitrousoutlet.com/i-30560127...ion-block.html
    2015 Camaro 2SS 1LE
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    1995 Firebird Formula - Le2 H/C, SBE, CPT 4l60E, boost?
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    The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ P600B/ CPT Pro Race 4L60E/Pro Torque 3200
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  3. #3
    LTx Guru


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    I responded to your post on CZ28.com

    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.

  4. #4

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    SSlowBoat, Thanks for sending that Nitrous Outlet link, and Injuneer, Thanks also for the links you sent me over on CZ28.com too.

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