v6 to v8 stock tach conversion

Is anybody manufacturing a module to convert a stock dash's electronic tach that was originally intended for a v6 and making it adapt to a
v8? Im thinking about building a convertor to do this if there arent already commercial (affordable) modules to do this. These shouldnt cost more than $35-$50 to sell. Let me know if there is any interest in custom electronics like this.
Thanks -Eric
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