I'm in the same boat as well - looking for a sandwich plate to install a pressure sensor. However, I don't even know where to get these parts. I saw a TRD adapter, but it's well over $150.
For those who have installed the sandwich style adapter and sensor, what did you buy? Is your gauge connected to the battery, or mechanical? If battery, how did you tap into the fuse box? Are there any holes in the firewall, or did you drill one to run the cables?
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