you sure you have a v8 tach there? that sounds about what a 6cyl tach might read when used with a v8. X2
I'd look at EBAY for just the tach part. I'd trade you a factory clock for the small fuel gauge...1983 chevy k10
http://cgi.ebay.com/ebaymotors/73-91...item45f7bf3c1e