Mechanical to electrical
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Junior Member
Joined: Mar 2018
Posts: 80
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From: NY
Car: 1987 Firebird
Engine: 2.8L V6
Transmission: 700r4
Mechanical to electrical
I’m trying to instal a 140 dash in my car but mine is mechanica and the one I bought is electronic how do I convert this to work?
Re: Mechanical to electrical
Start by doing a search. The thread is out there, you just have to find it. Maybe try Google and keywords like firebird speedo convert electronic.
Joined: Dec 2004
Posts: 16,744
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Joined: Dec 2004
Posts: 16,744
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Mechanical to electrical
Or use a Vss sensor with a Vss buffer or Dakota digital sgi-5
https://www.tpiparts.net/inc/sdetail/7587
https://www.tpiparts.net/inc/sdetail/7587
Joined: May 2004
Posts: 5,338
Likes: 72
From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: Mechanical to electrical
shouldn't an 87 firebird come with an electric speedo?
my understanding was that the electric speedo started in 86 on the firebirds, but of course I could be wrong...
my understanding was that the electric speedo started in 86 on the firebirds, but of course I could be wrong...
Joined: May 2004
Posts: 5,338
Likes: 72
From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
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Joined: Aug 1999
Posts: 5,261
Likes: 461
From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: Mechanical to electrical
Going to have to install the yellow VSS Buffer box and get the correct electric VSS with the correct (electric) speedo gears in the tranny. IIRC the 87 Firebird dash harness is already wired for the electric speedometer and you just need to add the correct parts. However; I'm not sure if the 2 wires leading to the Tranny mounted VSS are included the engine bay harness,... so plan on needing to also add the tranny VSS plug and wires. ( I think they connect to the Buffer thru/at the C207 connector )
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