[Dave Samson]

I have just installed an MSD 6A and coil,etc. My research convinced me not to use the electric Smiths tach because it would not interpret the square shaped signal from the MSD unit. The MSD provides signal for the tach and separate Autometer Shift Light module. I bought an Autometer tach for $90 , stripped it down and fitted it into the body of the Smiths tach - worked first time, is accurate and esthetically looks the same.