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I've got the sensor and power grounds run as 2 separate wires in my MS install - does it matter if I ground them both to the (-) battery post, or should I ground them to 2 separate locations?
My MSPnP documentation suggested using different grounds. They suggested using the motor to ground the cpu while using another location to ground the wideband. Now that I reread your question I'm not sure if that's what you're asking. I get the power ground. That's for powering the unit. But by sensor are you asking about a wideband or another sensor?
I would use separate ground locations, you may have high frequency ripple out of the ECU or a sensor or both; getting a little distance between them can help reduce problems with that sort of thing.
It's what I was always told to do with aircraft system installations in my former life as an aircraft electrical engineer and I can see how it might work out that way. Short ground wires to good grounding locations, and make sure the engine block itself is well grounded, and you should have a good shot at a trouble free install in this regard.
The absolute best configuration is to run all the sensor grounds to the MS with one wire, then ground all the other MegaSquirt ground wires to a single point at the battery or engine block.
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