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Old 04-25-2019, 04:23 PM   #134
Scooby Specialist
Member#: 468393
Join Date: May 2017
Location: PDX OREGON
2017 STI


I think my gauge and its included relay will work for map switching without adding any relays.

Here's the diagram I came up with - where should I put the ground off the TGV? Does the rest look OK?

ETA - I just tested the gauge and its fail-safe relay (as wired in the diagram below) with a 9 volt battery. Seemed to work as it should - put the gauge in fault mode and I get 0 volts - put the gauge in non-fault mode and I get 9 volts.

I think adding in a fuse on the 5 volt input line to the ECU is a good idea.

Now I just need confirmation on where to put the ground off the TGV plug...??

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Last edited by PDXREALTOR; 04-25-2019 at 06:16 PM.
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