Looking for Rally Dash Tachometer for my 1970 Dart Swinger

Search web the after markets are on there . You buy it then buy the replacement face decal and you'll have a tach with newer electronics. I just did 2 of them. Here is one I changed from a 67 version to a 71. I have one in a 67. Even though your putting a 6000 face on and 8000 tach it is pretty accurate as far as compared to how accurate they were originally. The needle pulls off and pushes back on at any location you want easy. You can get the decal from "Classic Industries"

You can see I marked the face 12 and 6 o-clock with yellow dots before removing the decal so placement would be correct. I also made one for a 67

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Did you recalibrate the tach so it reads accurately on the 6,000RPM scale? Or do you just live with the error (750RPM indicated = 1,000 actual; 5,500RPM = 7,300+)?