Going to need a little more than 4 screws on the panels then, unless you use the one panel as a sensor.
On the spark plug wear, my father did once buy himself an Alfa Sprint, and got the aftermarket ignition coil, Optronic ignition ( aftermarket coil ate points in a week) modules and found out that he needed special Lodge plugs to have any chance of having the plugs last between services. The regular single electrode plugs would do 1000km at best before they had lost the side electrode ( only made for hard starting, the coil was happy to fire the huge gap when warm) and were eroding into the ceramic. This did allow for a very lean mixture, and gave a very big power boost as well, such that it was a pocket rocket, capable of outdoing a regular 3 series of the same period ( when the Golf/Rabbit GTI MK1 was introduced as a low cost high performance vehicle) and still was economical on fuel otherwise. I do remember going up a long (20km) hill with him, with the car loaded with cement ( taking to a building site) and a 3 series BM coming past us in 3rd gear. He put his foot flat, and in about 20 seconds we passed the BMW, still in 5th and still accelerating from 80 to around 160 at the top of the hill ( no traffic cops on an uphill, always on the other side with the radar gun) with the BMW a small dot in the rear mirror. He liked that car, just it ate tyres ( funny that), plugs and was made, as far as we could tell, from compressed rust, despite the best aftermarket anti corrosion treatments and regular washing and waxing. plus the handbrake was only there as a afterthought, though with the massive inboard disc brakes it could stop in about it's own length in town. He sold the special tools he made for the weekly handbrake adjustment ritual with the car, otherwise what became a 5 minute job took an hour or more, as the adjusters were right down the front of the firewall next to the exhaust manifold, and needed a socket on the end of a half meter extension.