Tach signal is picked up off of the distributor which still has six pulses so i think it will work. 1227747 ECU is software programmable for 3 cyl engine. I am using mapping for a stock 4.3. My 198 is a 3.2 which is almost exactly 74% of a 4.3 so I've reduced the base fuel pulse width of the 4.3 to 74%. It starts and I haven't got the foggyest idea what will happen next. Time will tell.
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