You dont have to isolate the sensor, only the meter. The sensor is a 3 wire
type (heater, sensor, ground). The sensor does not use the exhaust as a
ground. Its not theory. Been there done that.
Gergo
2011/11/17 Bob Spidell <bspidell@comcast.net>
> Would be very interested in exactly how you did this. How do you isolate
> an O2 sensor? They emit a (very small) voltage signal, referenced to
> chassis ground, and I was told by K&N tech support that their indicators
> absolutely would not work on +gnd, because of their input polarity
> (isolation or no).
>
>
> Bob
>
> --------------------------------
> Bob Spidell - San Jose, CA
>
> ------------------------------
> **
>
> You can use it on + ground cars with no problem. Just have to isolate it
> from the chassis. My car is also + ground.
> BTW it may be good to point out, that there are two different types of O2
> sensors awailable. The wideband and the narrow band. Though the narrow band
> may be usefull as a controll device, it is not particulary usefull when
> setting up an engine. Esp. if the negine is nonstandard.
>
> Gergo
>
>
> 2011/11/17 Bob Spidell <bspidell@comcast.net>
>
>> Unfortunately, no help for us with 'pure' British essence: positive
>> ground (yes, I know some 'Merkin cars were +gnd, too).
>>
>> Bob
>>
>>
>>
>> On 11/17/2011 5:59 AM, Steve B. Gerow wrote:
>>
>>> I went to an air-fuel meter, the K&N:
>>>
>>> http://tinyurl.com/76t9dlb
>>>
>>> I mounted two O2 sensors on the downpipes with a dash switch between the
>>> two.
>>>
>>> I agree this is the best way to go because you can watch each carb's
>>> mixture while driving.
>>>
>>> Note - you don't have to buy their O2 sensors - any single wire sensor
>>> will do.
>>>
>>>
>>>
>>
>> --
>> ***********************************************************************
>> Bob Spidell San Jose, CA bspidell@comcast.net
>>
>> ***********************************************************************
>>
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