There is a large Stewart-Warner tach/oil pressure/temp unit for sale on ebay, listed as an Aeronca part, but its not marked as such...looks like the early Model B instrument cluster to me.
http://cgi.ebay.com/ebaymotors/Aeron...32631525QQrdZ1
Dave
http://cgi.ebay.com/ebaymotors/Aeron...32631525QQrdZ1
Dave