Originally Posted by
dojj
you will need the actual cosworth rev counter, with the C under the needle to read correctly
You don't need the actual cosworth rev counter, any 4 cylinder rev counter will work. The Cosworth rev counter with the 'C' just means the red line is at a different value (~6500 RPM vs. ~6000 RPM for normal Sierra clocks). And I believe some Cosworth clocks don't even have the red line at all.