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Thanks Strombomb for that link. I'd actually also stumbled on that page and think it explains why my recent attempt at using tach-adapt did not bear fruit - The early boxster cluster tach being powered and essentially wanting a pulsed ground signal. I am looking for a tach adapter that will provide that kind of signal modification.
But for now, I drove the car home! A joyous and maybe frightening experience but made it.
As a stop gap I am using Torque app to monitor RPM and coolant temp. It's not a great long term solution so will continue trying to figure out this tach, or maybe add a aftermarket physical gauge.
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