Great news on the ECU front. Joe of Locash Racing very generously tested my Hondata ECU and found that indeed, the engine has to be running for MAP to read. He said A/F read fine, too, but only after the engine’s been running for about 45 seconds. In the 30 seconds I’ve run the engine, A/F has always been frozen, so that explains that. Knowing the ECU is good is a HUGE step forward mentally (and financially). I can now move forward knowing that when something doesn’t work, it’s either wiring or a bad sensor, not the ECU.