Wiring aftermarket tacho to new DF25

[NSS]

Hi all

Have just bought an aftermarket tach (see 52mm White Face Rev Counter Tacho Tachometer Gauge ( Waterproof & UV Proof ) | eBay ) to connect to my newly acquired a new Suzuki DF25 (V-Twin). There are four terminals on the back of the tacho including one which says "Connect to RPM Signal".

I have the manual supplied with the engine but the wiring diagram gives no indication as to where such a signal can be picked up from.

Any ideas or should I contact a Suzuki dealer?

Cheers.

[NSS]

Cancel that request. Have now found the answer to my own question!

[Crusher]

Glad we could help!

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[NSS]

So am I, thanks ;-)

[NSS]

Well, all connected and working, but readiing (at a guess) double the revs. Any ideas?

[9D280]

Somewhere on the back of the tacho will be a switch with (at a guess) 2-4-6. fiddle with that until it reads sensibly.

Background: the tacho counts the pulses of voltage that the alternator spits out in a second. Alternators come in different guises, with more or less poles in them. Net result of this is that for a given RPM an altrernator with, 4 poles will throw out 2/3 of the pulses that a 6 pole will. If your switch is set to 4 pole and you have a 6 pole alternator, the tacho will think the engine is going 50% faster than it actually is because it is seeing 6 pulses per rev when it is expecting to see 4. (& vice versa)

[NSS]

Originally Posted by 9D280

Somewhere on the back of the tacho will be a switch with (at a guess) 2-4-6. fiddle with that until it reads sensibly.

Background: the tacho counts the pulses of voltage that the alternator spits out in a second. Alternators come in different guises, with more or less poles in them. Net result of this is that for a given RPM an altrernator with, 4 poles will throw out 2/3 of the pulses that a 6 pole will. If your switch is set to 4 pole and you have a 6 pole alternator, the tacho will think the engine is going 50% faster than it actually is because it is seeing 6 pulses per rev when it is expecting to see 4. (& vice versa)

There is indeed a switch on the back which, supposedly, sets it for 2, 3, 4, 5, 6 or 8 cyclinder engines. Mines a 2-cylinder but, having checked, the switch is currently set at 8-cylinder. Moving it to the 2-cylinder position shows a tick over rpm of over 6,000 !!!

[9D280]

Originally Posted by NSS

There is indeed a switch on the back which, supposedly, sets it for 2, 3, 4, 5, 6 or 8 cyclinder engines. Mines a 2-cylinder but, having checked, the switch is currently set at 8-cylinder. Moving it to the 2-cylinder position shows a tick over rpm of over 6,000 !!!

That scale isn't #cyls, its # alternator poles........

keep notching it up. It wll get sensible somewhere further up the scale (I did the maths and guess 6)