I posted this on the LT1 Edit boards and Ill repost here FYI

I've been fooling around with inputting my Vlin from
> my Aussie WB into the
> oil temp input to the PCM. So far, here's what I've
> found. It looks like the
> Oil Temp input (Blue 26) to the PCM actually reads
> 5.03 V to Ground. When
> the input is open (infinite resistance) , Datamaster
> reads -34.2 Deg F. I
> assumed the temp sensor is just a resistive device
> to ground. So, I took the
> 5 Volt PCM Oil Temp input directly to ground. Result
> was 325.8 Deg F on
> Datamaster, So the Temp Span is a total of 360 Deg F
> in 5 Volts or 72 Degrees
> per Volt. Now down to the real problem. I believe
> that this type of input is
> called a "sinking" input, ie input wire actually
> carries + voltage and is
> drawn down to ground by a varying resistance device
> (temperature sensor). The
> WB Vlin out is simply a positive linear voltage (as
> referenced to ground) so
> tying the WB Vlin to the sinking input has issues. I
> actually tried to tie
> the two together and I got results. The problem is
> that PCM temp input is
> supposed to be sinked to ground. When the Wb is tied
> to Blue 26, we're sinked
> to the WBvlin and the response does not seem to be
> linear or predictable
> within the accuracy that we'd like to see AFR . So
> I'm going to keep testing
> some stuff to see if I can get any kid of
> predictable calibration. Maybe its
> back to trying the AC pressure input. We really need
> some clever person to
> hack the code and add a patch for a WB input. Hey,
> The SyTy guys did it, and
> the Third Gen guys are very close as well ! Scott
> are you out there?
>
> Disclaimer: I'm an electronically challenged ME so
> if the stuff above doesn't
> flush well with you more knowledgeable folks, please
> feel free to
> correct/edit/or add.
>
> Steve