Installed a new tach - what are you guys reving at?

Installed a new tach and I'm wondering what my redline should be, 1st high, 2nd high and 3rd. I seem to be running too low - around 3200 in 3rd. I'm guesing my tach is only reading "half" of the actually rpms. And if it isn't is there a way to make a tach output X500 instead of X1000 rpms (just so I can get a better sweep of my tach)?
I followed the instructions ( http://hp.autometer.com/instruction_download/instructions/320h.pdf )
and cut the brown wire for a 6 cyl, but I wonder if the odd fire makes a difference. I mean I can live with it I'd just like a larger sweep.

Thanks for the info.

 

morning, 3200 in 3d at what speed with what gears in the rear? Randy

 

Sounds about right, Mine runs around 3000 RPM at 60 MPH (5.38's and 35" tires)

 

Mine runs 3400 @ 55mph. Chevy 350 with 5:38's and 31" tires

 

Great thanks. I've now got to find a way to re-calibrate my tach to read X500 rpms. I hope its possible. I'll give Autometer a call and see what's up. Thanks again

 

Why not just buy a tach with the sweep you want? I run a 6000 RPM sunpro in mine, but you can buy them as low as 4000 rpm

 

Gift from wifey. So it has to go in.