Quote:
Originally Posted by MikeCL
... I have a feeling it’s a zener diode .
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Not a zener, just two ordinary silicon diodes to isolate the two signal sources. They're probably 1N400X, where X is an integer from 1 to 7, indicating a voltage rating of 50 to 1,000. You can get 100 of them from Mouser, and with shipping they'll still be under $19.
I'm confused though... I assumed you already had the motorcycle, since you've been working on things like a gas tank and petcock, and have bought some other parts.