Dashboard wiring/ Speedo/Tach

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16 Nov 2005 12:55 #8514 by Shoey949
Dashboard wiring/ Speedo/Tach was created by Shoey949
I have an '83 GPZ 550 and an '81 GPZ 550 motor. The motor has a mechanical tach but the display is for electric. I probably could find an '81 dash fine, but I don't like the display a whole lot anyway. Does anybody know how to convert the mechanical tach to electrical or vise-virsa? How hard is it to home-made wire your own neutral light and such?

Thanks,
Nate

'83 GPz550H2 w/'81 GPz 550D1 engine
Dynojet Stage 3 kit, MAC 4-1, UNI Pods, DYNA coils and plug wires, WG ignition mod

Grand Rapids, MI

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16 Nov 2005 20:27 #8570 by guitargeek
Replied by guitargeek on topic Dashboard wiring/ Speedo/Tach
You have to plug the hole where the tach cable comes out of the head. If your gauges are stock, they should already be hooked up to the coil...

1980 KZ750-H1 (slightly altered)
1987 KZ1000-P6 "Ponch"
1979 GS1000 "Dadzuki"

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19 Nov 2005 19:16 #9077 by dbroten
Replied by dbroten on topic Dashboard wiring/ Speedo/Tach
My tachometer suddenly quit working right when I was starting my '79KZ650SR a few weeks ago. Cable looks OK, no leaks, looseness, or attachment problems. Is there any way to fix this tachometer? Replacement costs $175--Ouch!

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19 Nov 2005 20:37 #9096 by steell
Replied by steell on topic Dashboard wiring/ Speedo/Tach
I have an extra tach for a 750B (maybe a different redline, otherwise the same), and possibly a 79 650SR tach from my nephews GPz750/650SR conversion. I don't know what teh redline is on a 650, but my 80 750 twin tach has a 9,500 rpm redline, while I think the 76-79 750 twins have an 8,500 rpm redline, and it's the same motor. I have not seen an accurate one yet, so I don't guess it makes any difference :)

Enough thread hijacking.

A neutral light has a positive wire going to it, and the switch grounds it out, same with the oil light, high beam indicator is different though.
And like guitargeek said, if you used the 83 coils and wiring, the tach should be working. I think the 83 GPz750 uses a wire from the igniter to drive the tach though, I'm not sure about the GPz550.

I bet Loudhvx will know :D

KD9JUR

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19 Nov 2005 23:10 #9120 by loudhvx
Replied by loudhvx on topic Dashboard wiring/ Speedo/Tach
Steell's right on. The wire from the ignitor to one of the coils is branched off to the tach.

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20 Nov 2005 09:28 #9167 by Shoey949
Replied by Shoey949 on topic Dashboard wiring/ Speedo/Tach
Alright I'll have to check to see if the coil is wired up to the tach, I just saw the opening for the tach cable on the engine and none on the display and I panicked.

'83 GPz550H2 w/'81 GPz 550D1 engine
Dynojet Stage 3 kit, MAC 4-1, UNI Pods, DYNA coils and plug wires, WG ignition mod

Grand Rapids, MI

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25 Nov 2005 10:39 #10165 by Wild and KZ Guy
Replied by Wild and KZ Guy on topic Dashboard wiring/ Speedo/Tach
I was getting weird noises from my valve cover, pulled it, and found the molded-in tach drive gear on the cam is about 60% chewed up. The gear on the pinion that goes out to the tach cable is ok, and the Tach itself appeared to be working fine...very strange.
Rather than replace the cam, I would like to put an electric tach, that reads off the coil neg wire. I've read that I can use a standard tach and wire it off either of the 2 coils. Has anyone else done this? Does anyone know of a replacement tach that won't be too hard to retrofit cosmetically?

Post edited by: Wild & KZ Guy, at: 2005/11/25 13:43

A couple of Old School Minibikes
1980 LTD KZ650 E1

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25 Nov 2005 16:02 #10220 by Wild and KZ Guy
Replied by Wild and KZ Guy on topic Dashboard wiring/ Speedo/Tach
...doin' some more thinkin'..(coupla beers always helps); How about if I buy a new electrical tach, like a "Sun" or something, and replace the original mechanical tach guts with the Sun guts? Plug the pinion hole on the head, and "I be Tackin'"! Think about it..Intriguing, huh?

A couple of Old School Minibikes
1980 LTD KZ650 E1

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