Looking to add a Tic Tac Toc gauge to my dash (replacing the Idiot light gauge on the right side). If not a Tic Tac Toc, then I would like to add a Tachometer to the right side dash.
'67 442.

 

The "tic tac toc" nickname was applied to 68-72 since they have a speedometer, 3 gauges in a pod, and a pod with a tach and a clock (hence the tic tac moniker).

The regular production option (RPO) 21 "Rocket Rallye Pac" was available in late 66 and 67, and had tach, clock, amperage, oil pressure, and temperature all in one unit, making the 66 and 67 have one more gauge (amperage) than the later cars, even though an amperage gauges doesn't do much until things get really wrong.

Welcome to the site.

The 67 rallye pac is an expensive beast. A lot of people will drop a tach (one aftermarket model fits well), and hang a set of three gauges below the dash as a cheaper alternative, and that gets you everything but a clock, which is the least useful gauge.

 

$1329.99 Not mine:
https://www.ebay.com/itm/30410452484...QAAOSwWv1hFfxk
I had parts to make a rally pack/ speed warning dash a few years ago (see pic below). I sold them on ebay in 2019 for close to $1000 (just what is shown in the pics) so the listing above for a complete dash with printed circuit is not unreasonable.

 

I hung a small tach on the left side of the dash like a 66 has. But used a small aftermarket one. Works so much better than the factory one that is inaccurate and near impossible to read when driving.