Working speedo gauge without ECU
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Joined: Apr 2005
Posts: 490
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From: Hamilton ON Canada
Car: 87 GTA t-top
Engine: L98 350 w/RMT
Transmission: 700R4
Axle/Gears: 9 bolt BW 3.45
Working speedo gauge without ECU
Im running an 87 TPI auto Firebird with aftermarket ECU, what is needed to get the speedo working?
Do I need to connect a wire (light green or brown) from the vss buffer box to...?
Do I need to connect a wire (light green or brown) from the vss buffer box to...?
Re: Working speedo gauge without ECU
If your car is same as the Camaro then you have a mechanical cable driven speedometer. The VSS is in the speedometer head and sends a 4000ppm signal to the buffer box which sends a 2000 ppm speed input to the ECM (stock). Check for broken cable or inoperative Speedometer.
Thread Starter
Member
Joined: Apr 2005
Posts: 490
Likes: 1
From: Hamilton ON Canada
Car: 87 GTA t-top
Engine: L98 350 w/RMT
Transmission: 700R4
Axle/Gears: 9 bolt BW 3.45
Re: Working speedo gauge without ECU
I connected the green wire from the buffer box to the brown wire that was connected to the vss on the ECU. Didnt work.
WHat am I suppost to connect to?
WHat am I suppost to connect to?
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Working speedo gauge without ECU
lt green to speedometer and the input to the ecm will determine on what ecm you are using and the specified input
Thread Starter
Member
Joined: Apr 2005
Posts: 490
Likes: 1
From: Hamilton ON Canada
Car: 87 GTA t-top
Engine: L98 350 w/RMT
Transmission: 700R4
Axle/Gears: 9 bolt BW 3.45
Re: Working speedo gauge without ECU
Figured it out, I had no ground to the buffer box, grounded it and speedo works fine.
Thanks
Thanks
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beachrodder
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Aug 7, 2015 04:27 PM
