MPGuino reading MPG backwards? Helpsky?

[SVOboy]

91 crx, b10, it's not the stock color because I repinned most of my ecu plug wires.

[dcb]

I'm concerned about your car speedo getting conked out, something does not sound wired right at all. It does not seem likely that a speedometer circuit should notice a 100k resistor tapped into it.

[SVOboy]

It conked out because I accidently wired the injector signal to the speedo. There are two identical looking wires from b10 to the speedo area, one to the mpguino, another to the speedo. I switched the injector signal with the speedo one, not the mpguino one. No worries.

[starquestPilot]

I'm wondering if your injector circuit is high-active (not low-active like the rest of us)...