Hi, have you measured the supply voltage at the sensor, and have you tried any bypassing there, ie 10uF, 330uF at it PCB.
330nF is good on the 78 series reg but they also like 10uF on their output.
Are all you gnds good?
Tom.... 
Hi, have you measured the supply voltage at the sensor, and have you tried any bypassing there, ie 10uF, 330uF at it PCB.
330nF is good on the 78 series reg but they also like 10uF on their output.
Are all you gnds good?
Tom....