Tach mounting

I made my own back in the 70s, from a piece of
aluminum sheet, about 2 x 12 x~1/8 thick ( just thick enough to be tapped for 10-32 machine screws).
It hooks under the BACK of the pad, follows the contours to the front, then a short stretch over the front and back toward the heater controls. It is just loose enough to remove and has been on several on my cars since then. It is tight enough not to flop around, and loose enough to be slid from side to side. No special tools so far.
Then I drilled and tapped the plate for to retain the supplied tach mounting bracket. When done, I wrapped the thing with electrical tape.
Finally, I brought the wiring up from the bottom, thru a window in the dash-frame that was already under the pad, and looped it towards the windshield and then back around the back of the pad and up to the tach.
For the track or showing off, I slide it front and center, but for street driving I leave it over to the right.
I don't like those big 5" race tachs, and I gotta admit that selecting a 4 incher was a real chore. Finally, I found what I was looking for; one with an 8000rpm/270* sweep. The autometer I chose has a built-in dial-type rev-limiter, plus a shift light, plus an adjustable shift-indicating needle; all of which have proven accurate enough for street use.
I usually set the needle to around 5500 rpm, so as not to intimidate anyone who might actually look at it; otherwise, I pay no attention to it.
I set the rev-limiter to 7200 in case I blow a shift ( 4-speed) to protect my engine.
The shift light comes on some 200 or 300 rpm sooner, I forget.
On the street I rarely look at the tach ...... because top of Second gear is over 80 mph, and I rarely purposely go there.
I thought I needed a tach, but it turns out that it is just as easy to shift by the Speed-O.
But it looks cool, sitting up there like a proud little rooster.
Back when 65 was ~2900, I used to use the rev-limiter as a speed limiter while hi-way cruising; but now, with od, 65=2240, and being a dial-type, it ain't particularly accurate.