Aftermarket tach for 1967 Barracuda

That one bolts right into the housing like OEM . This is the only pod of your rally housing that allows instrument to change out without panel disassembly. Once you place a new instrument in with the old, the old will show their need of screen clean and needle paint. That will require disassembly.
Thanks for the info. And thanks for mentioning the Rallye cluster. I ordered this one instead: 1967 Plymouth Barracuda Parts | MA1525 | 1967-71 Mopar A-Body Rallye In-Dash Tachometer With 0 @ 5 O'Clock | Classic Industries
It's on backorder though. :(