First decide what tools/gear you are going to use and find out what air capacity they need.
With that it should be pretty easy to select th eproper compressor
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<font color="blue"><i>1981 TR7 FHC Sprint (better known as 't Kreng)
1980 TR7 DHC (my first car currently being restored)
In parts a 1980 TR7 PI DHC, 1981 TR7 DHC, 1981 TR7 FHC</font id="blue">
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http://tr7beans.blogspot.com/</i></font id="red"></center>