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As you probably know - there is a hole in the dash of HD/HR's between the speedo and the fuel gauge.
The hole will fit a Speco Tacho 520-01 (google speco 520-01 and you will get the speco site and a pic of the tacho).
The hole in the dash and the tacho body are 2 and5/8 inches.
The tacho is available from Autopro and selss for $99.