Stack display system, need help

[Jimmi The Kid]

I have an old Stack ST868 display system, but missing all the sensors. New originals sensors pricetag are insane! Have anyone fidle with some aftermarket sensors?
I have heard that VDO sensors work, but at deamon-tweeks, these cost more than original Stack
First of all, I need 2 analogue 0-10bar fluid pressure senders, but the impedance are really important. I have a 3-160ohm sender, and this do not work.

Next are the speed sensor, Stack messuring with a inductive sensor, like an abs sensor. I planned to fit a abs sensor at the driveshaft. Can anyone come up with a nice solution?

[Ivan141]

As far as I can find you just need a pulse proportional to your speed, a hall sensor with 2 magnets on the drive shaft might work, 1 is enough, but with 2 you can balance the driveshaft out.
VDO sensors shouldn't be as expensive as the dash, hunt some on ebay if new ones are to expensive.