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Thread: Installing a VSS Sensor with Holley EFI

  1. #111


    Hello. I have a question in regards to this post. I found this and it looks like the solution I was looking for, but no luck so far. I have a Holley Dominator & Tremec 6 speed transmission with reverse lockout. My original intention was to send the VSS sensor & ground to the 558-400 Auxiliary Harness as described, in order to provide and input for the Holley EFI 553-122 CAN speedometer. In discussions with Holley Tech, this is not possible for the speedometer to read VSS information. It is only available through the J4 plug directly from L480 or L460 transmission. I see this post was post was listed some time ago, and I was wondering if at that time, the Digital Dash was capable of reading the VSS signal. Do you have any suggestions on how to output my 16 PPR signal to the Dominator in order to send signal to the CAN speedometer? Thanks.

  2. #112


    You can do all this by getting the J4 ECU side connector and move the pin from the 558-400 (on the ECU side) to the appropriate pin on the J4 connector. I then created a custom speed input and assign it to that pin (I forget the exact one). I also have a custom output that powers the reverse lockout solenoid. It's programmed to active below 5 MPH, like OEM. This information is then fed to the 7" Digital Dash, via CAN. Andrew

  3. #113
    Join Date
    Dec 2009

    Default (Speedometer Output Info - Dominator ECU/Transmission ICF)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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