| I would NOT recommend grounding any Wideband controller (of any brand) to any chassis or other wired ground, only to the Battery negative post. Its is possible to pick up transient grounds otherwise. Its by far the best way to do it.
As for the +12v, Justin recommends the relay as the Zeitronix unit can pull to near 4 amps if loaded with the AFR Gauge accessory. Maybe not a good idea to tap off a wired circuit unless you are sure it can handle the extra amps.
I wired my Zeitronix directly to the Battery Ground post and my +12v I inserted into the fuse box in place of the horn. I unlatched and removed the horn wire, so no horn, but I do have now a dedicated 10 amp keyed on fused circuit just for the Zeitronix.
Here is a short video of my installation.
https://www.youtube.com/watch?v=J_SeJC88obs |
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