I wanted to post a follow up even though this was not my thread. I used the white wire from the fuse box for 12 volts like the original poster and I suffered from a lot of resets. I have now changed to a fused wire directly from the battery and no longer have any resets for several tanks of gas with MPGuino. Just in case any one else tries using the white wire from the fuse box, it appears to be too noisy for MPGuino.
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Prius MFD fuel Log
Prius Gallons at fill up Log
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