Install video of a 3" aftermarket marine tachometer in my 1992 Dodge D250 CTD. Tachometer is smooth as butter and works awesome.
I did not cover any of the design / 3D printing process, but can answer any questions that come up.
I did not calibrate the tach after installation. It is very close right out of the box, and since tachometer readings to the user are relative [i.e. checking RPMs before and after after a governor spring install] I didn't think the hassle of calibrating was worth it, especially with the A518's garbage torque converter always riding up on governor under heavy throttle.
-Tachometer: Sierra Designs Seastar 68358P (purchased amazon.ca)
-Housing material: (PETG, Polymaker Polylite)
-Printer: Prusa I3 MK3S
-Wiring is unknown plenum cable (multi-strand 22AWG 4-wire+ground), but does a nice job keeping things tidy underneath the Techflex sheathing.
