Tachometer 123?

[tomfg]

I'm going to have to pull my instrument cluster out soon and see if I can fix the irratic speedometer, as it doesn't seem to be just the cable.

I'm thinking / wishing that it sure would be fun to install a
tachometer in the 64 gauge cluster while it's out.

Then I could see how many rpm's it's taking to get my 4.11
differential up to 55 mph on the road. Sure, I've used the
calculators online, but seeing would be more fun.
I even wire up my tach / dwell meter thru the dash
to see, until I realized it only went up to 1500 rpms.... oops.

I've looked over all the forums on tachometers for our trucks,
but haven't really seen any thing definite saying that if you
buy brand X, Model 123, etc., that it will fit.

I'm not looking for factory original 50 year old tach that
may or may not work, and I might have to spend another
$200 bucks on.

I know one of the Chevy parts places sells a tach kit
for about $200.
Are there other cheaper options. I'd be a little leary
of those $25 Chinese tachs.

So, what Brand / Model tachometer will fit with minimal alteration,
look decent, and at what price range would get me something reliable?