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I'm testing with a 89 Caravan 2.5 TBI. I'm getting sensible data with 15500 pulses per mile and 72.5 seconds per gallon.
My board also has intermittent serial operation and intermittent loading. This is a serial v1.0 board. I also bought a serial v2.0 board which I will build when I get time. The v2.0 is claimed to have more reliable serial communications.
I forgot the 10k resistors when I built my board. I didn't see the line that said to install them. The board blinked but didn't respond to serial programming.
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