Convert 6 cylinder tach to 8

[adileo]

Hi guys

I just installed a used Westach, on 52 F1 (v8 flatty) It’s reading about 33% higher than what it should. I’m thinking it’s a 6 cylinder tach. After doing a google search a possible remedy would be to add a 1/2 watt resistor on the power/coil wire.

Before I attempt this, I would like your thoughts.