Kare Design Wall Decoration Beetle Mirror, gold, glass mirrored, frame polyresin, bug shaped, vertical wall mounting, 39x25x6cm (H/W/D)

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if (R2 > 966 && R2 < 1029) {digitalWrite(in1, LOW); digitalWrite(in2, LOW); digitalWrite(in3, LOW); digitalWrite(in4, LOW); digitalWrite(in5, LOW); digitalWrite(in6, LOW); digitalWrite(in7, LOW); digitalWrite(in8, LOW); } Actually looking again at the schematic I see four toggle switches, which at a glance appear to be in H-bridge formation. That would suggest you can use a dual motor driver. Genuine NOS VW distributor points part number 111 998 061 for Garbe Lahmeyer & Co VW badged distributor from the early 1960s Next replace the switches of the Pontiac ones with MOSFETs, which in turn are controlled by the Arduino signals. Note that you need high side switching, so p-channel MOSFETs, and that in turn requires a second transistor (small signal NPN or BC547 will do great) to switch it.

if (R2 > 1051 && R2 < 1179) {digitalWrite(in1, LOW); digitalWrite(in2, LOW); digitalWrite(in3, LOW); digitalWrite(in4, LOW); digitalWrite(in5, LOW); digitalWrite(in6, LOW); digitalWrite(in7, LOW); digitalWrite(in8, LOW); }

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like these? - https://www.heritagepartscentre.com/uk/ac198900-barrel-piston-kit-1776cc-90-5mm-x-69mm-forged.html

Some info is here - http://www.thesamba.com/vw/archives/manuals/Bosch_Tune_Up_Parts/Bosch_Tune_Up_Parts.pdf

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It is not mentioned in the schematic, but those "illumination" LEDs should have a current limiting resistor of sorts. You may be able to replace those resistors with a lower value and run the LEDs themselves off 5V. Otherwise it may be possible to simply replace the LEDs themselves for a set of your own, with appropriate resistor for 5V supply.