autometer a/f ?

[DaytonaConnection]

three wires red,power blk, ground, purple, 02, do i ground, to the batt, or to the 02 ground , its a 4 wire 02....

[diabloed]

i grounded to a common point behind the radio. works just fine.

others say you should go to the battery for ground though.

[DaytonaConnection]

i know the 4 wire 02 has a ground for the 02 and a ground for the heater..

[eski]

I did put the ground wire from meter to battery.

[DaytonaConnection]

what if i ground it at the box where the batt ground is, or does it need to go right to the batt post.....

[saxhouse]

Lot of past discussions. Do a search and read for hours. I am pretty sure it has come down to battery or fuel rail are the best ground points.