I have the dash that has fuel / spedo but no tach. Is there a way to put in the factory style tack without butchering my original stuff? I would like to keep the stock look but add an acurate electric tach. Does anyone make a bolt in aftermarket tach ?

Ok did some research and ordered this ...
http://www.shiftworks.com/tachs-ss.htm#1970
Anyone else used this tach ?