Air/Fuel gauge install [Archive] - SaabCentral Forums

: Air/Fuel gauge install


gpm2003
21st May 2003, 09:17 AM
hey. i got a air-fuel gauge but the installation instuctions arent clear. i was wondering if anyone knew how to install the wires (3 of them). also does anyone know where i could find piller pods for saabs?(9000 cse). thanks
graham

Nuts
27th May 2003, 04:28 PM
My first post here on the "Sedan" Forum :! :cheesy:

I've installed an A/F ratio gauge on my 900 - the three wires are for:
- +12v positive - preferably off your dash lights, that way they will dim
- Earth/negative - loads of those behind the dash
- Signal wire from the lambda sensor

Be warned though, if you are using the standard lambda sensor, the gauge will only be good as an indication of your A/F ratio outside STOICH (stoichiometric range) i.e. it can't tell you by how much you are lean or rich - just that you are. You'll need a (very expensive) wideband sensor if you want it to be precise.

A/F gauges do look quite cool tho :! 8)

Nuts
28th May 2003, 04:24 AM
Sorry small correction: If you only have three wires then connect the red wire to a switched +12v rather than to the dash lighting. The A/F gauge normally doesn't have any facia lights other than the display LEDs :! :roll:

red - switched +12v
black - earth/negative
blue - lambda signal.

gpm2003
30th May 2003, 09:44 AM
where can i find this? and whats the easiest 12 volt wire that would turn on and off with ignition on a 1993 9000 cse?