On the gauges, I picked up the "speedhut" series for $575 for the compete six gauge kit. I ordered each gauge indivually customized, no so kit part number, but they have an infinite number of combos on their site. They also have standard configuration gauges available for Amazon Prime shipping if you want just the black face and silver bezel gauges. I ordered mine back in December so was fine with the wait time.
I don't have pictures of each step, but here goes.
This is what I wanted:
but it was out of stock, so picked up some 1/8 aluminum from my metal supplier and made my own.
Use some thin but sturdy cardboard for the template for the blank panel, and then placed traceouts of the gauge holes on the cardboard to mock up where you will use the hole saws. There really is very little room for error if you are planning on running a full set of speedo, tach, coolant, oil, volt and fuel.
If you've located your hole saw placement just right, you'll have minimal clearance issues. By that, I mean you'll only need to dremel the retainer lock rings on the back side of the gauges just a little to be able to spin each individually to toghten them. This sounds worse than reality, unless your hole saw placement was way off.
On to gauge hook up.
For the tach,you need to tap into an ignition control wire on one of the coils. I use an Alldata DIY subscription for $30 per year, which has all the wiring diagrams and connector views. You want to pick up wire "C" on the coil plug. It's the wire that changes color from coil to coil.
The tach programming instructions are pretty self intuitive for calibration.
On the speedo, I haven't driven the car yet, so can't completely confirm this works, but you need to pick up the speed output and ground off the vehicle speed sensor. This is wires 1 and 3, respectively on the connector. Once you can drive the car, you will drive to the preset speed and set the speedometer to that speed, so you will need a gps unit or phone app or friend. One option is to just upgrade to the GPS speedo unit - not a bad idea and something I wished I had done. The speedhut gauges are compatible with other gps sending units, so still an option.
Oil gauge: this one is lots of fun. You need to remove the filter housing in order to drill and tap into the same oil galley thay the stock gauge sending unit taps into. Hard to find anywhere else, and this is where V8r told me to tap into. I would say that a drill press is mandatory. There's not a lot of room for error here.
on the side of the filter housing:
Just a reminder, you'll be using a NPT tap. Do not run the tap all the way in. You'll likely bottom out the sending unit before you fully tighten up the treads. 2/3rds of the tap run in is probably fine. Once done, clean the filter housing, then clean it agian, and then clean it again for good luck. No upside in metal shavings finding their way into the engine.
water temp: this one is a little easier. Under the water neck, there is a flat boss area that is easy to drill and tap for the sending unti. I was able to do this without removing the water neck by blocking the passage way into the engine from inside the water neck and hitting the opening with the shop vac to make sure any metal shavings were not left behind.
Volt gauge: pick up an ignition hot wire.
Fuel gauge, pickip the factory sender output and follow the speedhut programjng instructions for setting full and empty settings. Pretty nice compared to set Ohm ranges on other gauges.
on your check engine light, I put mine (painless wiring led) in the center ofnthe gauges. It should glow lightly when normal and bright when it's tripped a code. The ecu provides the ground, and you provide the 12v.
For headlight high beem indicators, you need to tap into the miata solid red wire from the instrument cluster. Left turn is the green w/black wire, right turn is green w/ white wire. These little led indicators are built into the speedo.
Speedhut provides a convenient daisy chain to power the gauges along with a dimmer, so that is nice.
I've probably missed a few things here and there, but please feel free to let me lnow of any questions.
And just in case you're really crazy, speed dawg can send you a custom shift **** to match your gauges with the proper shift pattern.