Moderators: IMOC Moderators, IMOC Committee Members
(Nadir or Jeremy? 
) got a list of the different voltages that the ECU will see at different vacuum readings? It's either that or shell out £50 on a Marelli 03/04 MAP sensor which the ECU already has the data for. 
is 89420-17020 I think. now ill have to double check but the mk1b map sensor reads from vaccum to 3/4psi positive boost. working between 0.3 and 4.7v but ill have to double check hope that helps. what I need is a number of mV readings at different pressures so that I can plot a graph and from the equation of the line work out the specific entries for my ECU.+ 4435 where y=mV and x=air temp. I need to add a few more readings to the graph as I only have points between 19 and 50 degrees C. I'll be doing the same with the water temp sensor from the MZ. So far the readings have had a linear trend which has simplified things somewhat. 
- 0.5V
. . 6 . 7 . 8 5 . . . . i . . 9 
Will stick those numbers in the ECU and see what happens. 
(101-90kPa) to my MAP sensor and got some pretty accurate readings of the voltage seen by the ECU.+ 511.49 where y=mV seen for a vacuum of x (kPa).
...only joking Chris hoho! 
wow. bet you weren't expecting it to be quite that accurate! and it's pretty arrow straight, you should be able to extrapolate the full range from that pretty safely. hmmm I wonder how barometric pressure compensation works then..? . . 6 . 7 . 8 5 . . . . i . . 9