on a 71 could you get a tach with a non gauge dash. will a original tach work with a hei ing? im thinking of replacing my clock witch dosent work with a tach. any help thanks. i posted this in tech but got no response.

...... will a original tach work with a hei ing?

Yes it will

Shiftworks (http://www.shiftworks.com/tachs-ss.htm#1970) has tachs that fit in place of the clock.

You could not get a tach with a non gauge dash from the factory.
If you ordered gauges you got the ss style round gauges dash.