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If the RPM transducer worked before and there are no broken transistors, your box is probably fine. You said you blew one of the engine bay fuses. Did you replace it? I would think it would work again.
You know, I like my idle to be up around 1500 or so. It is smoother, probably compensating for reversion and worn throttles. How much do you idle, anyway? 2000 rpm is not so bad. If you run into speed switch occilation with that, you can tweak the limits for the fuel shutoff in the RPM transducer. This takes a potentiometer, a singal generator (distributor simulator), and a scope. I had a bunch of way old, out of calibration stuff I got from some elctronics warehouse. Put a 12V offset DC square-wave to replicate the points signal. Then vary the Hz to change the RPM. You can see when the relay is open/closed on the scope. If you vary the resistance in the potentiometer, you can change the lower limit.
This is all detailed in the thread I linked.
I would rather have a high idle than go through the trouble and expense of removing and rebuilding the throttles at this time.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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