Autometer gauges are ordered- good advice appreciated

Definitely looks like a nice gauge. I'll be fine with my standard autometers though. They will do the job.

But now that a few people are subscribed, I'll break into my questions lol.

I ordered the Lokar speedo cable to hook up to my A-833 and Autometer mechnical speedometer. Do anybody know if there are any corrective gears needed either in-line with the cable or on the transmission itself to make the speedometer read right? I know rear gears and tire height will obviously change this as well, but strictly refering to just the transmission and speedo, will I need to correct this ratio at all or is it pretty much just plug it in and hope for the best?
Thanks

-Mike