SOHC.co.uk Forums > Anorak's Corner
Koso gauge RPM set up
K2-K6:
--- Quote from: McCabe-Thiele (Ted) on September 28, 2024, 07:53:48 PM ---So how did you connect the wiring to make it work?
Might be worth posting the connections/colours you finally used to get it working for the benefit of others here.
--- End quote ---
Yes, it would be useful info in thread if anyone else then searches for the same .
It should be any one of the yellow wires from alternator windings toward the rectifier Ted. Any of the three would give a "pulse count" to the tachometer if it's equipped to take that input.
I was working with someone on a car and didn't initially realise they did this. It had various input to ecu from electronic ignition etc but with tacho traced back to alternator. Thatt had a winding "tapping" on back of case that came from prior to rectified output post.
Peculiarly, he'd changed the pulley diameter on the alternator such that the rpm was showing different to crank speed ;D which won't happen on these Honda engines with winding etc being directly on crankshaft.
That had dome industrial head scratching going on ;D
DomP:
--- Quote from: McCabe-Thiele (Ted) on September 28, 2024, 07:53:48 PM ---So how did you connect the wiring to make it work?
Might be worth posting the connections/colours you finally used to get it working for the benefit of others here.
--- End quote ---
I'm amazed Koso didn't suggest this in their set up instructions and that it has taken over ten emails to them to get this sorted, it really was as simple as running a wire from the rpm signal wire to any one of the three yellow wires coming from the alternator. I didn't get an accurate reading straight away but that is adjusted in the gauge menu depending on how many signals you are getting per rotation.
Instead Koso suggest either wrapping the signal wire ten times around a plug ht lead or connecting to either the blue or yellow wires coming from the points, or in my case Dyna S ignition, the wrap method gave no read whatsoever where as the ignition method gave me a fixed 1000rpm at any rev range.
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