Go to Maplin's and by a diode about 70pence tell them what voltage etc. that you want it for and make sure you ask which way the current travels through it, they usually are marked with a coloured band on the outlet end.
What a diode does is allows a current to flow in one direction only and stops any reversed spikes, ideal for rev counters picking up a feed from the coil or EFi injectors.
You can carefully crimp some wiring terminals on it and wire it in line, I don't recommend soldering.
On second thoughts buy a few, they come in handy.
p.s. I am not a wizard and if there are some leccy techy people about feel free to correct me.
Last edited by phil.coyle; 18th September 2016 at 20:41..
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