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Summit sells a variable control rev limiter... good for unlimited applications depending on the chip you put in... Summit part number ATM-5301 for AutoMeter, MSD-8670 for the MSD version...
The previous owner of my truck swapped in a HEI and didn't do anything about the resistance wire. Stupid thing was only getting like 8V. The motor wouldn't rev at all...it was so bad that if you left it to the floor it would never shift out of 1st gear.
I say the easiest way is to toss in a ballist resistor