woow, its gona take me a bit of time to work out how that circuit is working.So is that the sort of setup i would have to use on the sensor inputs so not to interfear with the signals goin back to my ecu.
im guessing that as the opamp should not be putting any load on the signal
thanks for all this help, its alot harder than i fault it would be but im learning alot from it and its even giving me more ideas for different projects.
i may have fault of one problem, The MAP sensor. The signal from this is gona be very messy because its measuring vacuum and pressure in the engine.when there is a vacuum in the engine its not constant as the pistons are goin up and down so i guess i could end up with a lot of voltage changes very quickly, high frequancy i guess. will this be a problem