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Thread: Sharing / Splitting MAP Sensor Signal Greddy Gauge and E-manage Ultimate

  1. #1
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    Sharing / Splitting MAP Sensor Signal Greddy Gauge and E-manage Ultimate

    I have a greddy v2 eletronic boost guage that is powered by a 3 bar sensor. It reads from -30 in/Hg to 30 PSI.

    I've been told that you can't share the map signal between the gauge and the emanage ultimate.

    So, I had an ebay MAP sensor (from Xaviar) and harness for the emanage, but after using it for a while I was really skeptical of its accuracy, especially since I plan on going to a map based tune and my engine depends on this sensor to be right.

    Rather than spend $135 on a greddy sensor and harness, I decided to try to share the signal from my greddy gauge. I hacked off the sensor off the aftermarket ebay map harness and soldered it into the Greddy gauge's harness.

    I only spliced the ground and signal (white) and left the red source from the emanage unhooked, because I had concerns that 2 power feeds may corrupt the signal.

    I am very pleased to say it works perfectly. The gauge and emanage are DEAD on.

    I hope this saves someone else some money. You can get the v2 boost gauge for $80 on ebay right now.

    Parting 6 speed
    Pampena 3.5 Stroker, GTX 2867 Gen IIs, AEM Series2, oohnoo SMIC, DN Hardpipes, FIC 1650s, Walbro 525, aermotive fpr, Dejon intake pipes, Tial Q, Koyo Rad, Samco Hoses, Stoptech 332mm fronts, HKS GT4 Coilovers, Spec 4+ LW, JDM 6 Speed, Billet shift forks, Pampena brace

  2. The Following User Says Thank You to Chris@Rvengeperformance For This Useful Post:

  3. #2
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    Good idea, also you did right not to connect the +5v red wire, that would have been bad for both the Emanage and the Guage.
    GTO-TT, PTE 1200's, M20, Emanage Ultimate, OS Geiken R3C,
    TD04-16g`s, Maf-t. 13g`s 12.4@115mph / 16g`s 12.5@117mph.

  4. #3
    SDSU Alumnus verified Feedback Score 4 (100%) bboyalan's Avatar
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    Chula Vista SD, CA
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    Thumbs up

    I just wanted to bump Chris' thread since I have also been doing this for 3-4 months already. My 60mm gauge reads in bar, and it utilizes a GReddy 3bar MAP sensor. This should also obviously work for Blue users who substitute the signal for throttle.
    3/S Street Tuner San Diego's Panda VR-4 v.3 w/ 38psi (peak) on E85+Meth | 3094 lbs as of 7/2/19

    '92 VR-4 - Fully built, AEM EMS S2, MHI EVO3 16G's, suspension, and corner balancing | '10 EVO X SE | '04 EVO VIII SSL
    4/1/21 - "retuned" est. 570AWHP VD SAE (580 U/C | second gear | 88F) holding ~30psi (more boost & less timing still... hehe)
    On the side (v.4): IPS single turbo kit w/ GReddy 70mm, BC 3.4 billet stroker crank, BC gears, Italo billet oil pump gears, etc.

    "There are no secrets better kept than the secrets that everybody guesses."


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