design improved output current of speed Sensor

hello my colleagues

i wanna design a SPEED SENSOR for an Automotive Application... but it works as unsuitable about output current.

we want to improve output current response for 3 users (ECU, Auto Flasher and Instrument panel).

TEST CONDITION: when we use 460 ohms as a pull up resistor (three paralell ~1.4K-ohms res for each user), we just see 13.5 mA on AmpereMeter.

Qustion: How can we improve this to higher than 15 mA?

Note 1: we don't want to change pull up resistor value !

Note 2: we dont want to change Hall-IC type.

plz see Attach image

i wanna design

I want to ask you what this has got to do with Arduino?