I've used that max232 ttl board with both 160 (various fiero ecms) and 8192 baud (7730) ecms. Also used it with tuner pro and aldldroid.
The chip comes mounted in a breakout board and all you have to do it push the supplied breakout wires onto the correct pins and away you go.
My two transistor board that i ruined started out as a one transistor for 160baud, then i did an ecm swap and built a two transistor for 8192, but i never could get it to connect. I gave up and bought the chip and never looked back.
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