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I believe the input comes from the shift sensor switch. There are wires coming off that for each gear position. When I first got my 1500 replacing my 1200 I missed the gear indicator and thought about buying an aftermarket unit. After riding awhile I decided I didn't need one. The sound of the bike at any given speed pretty well clues one in, and the relationship of the speedo and tach needles give it away too.

Then in fifth gear the speedometer needle will lead or be higher on the scale than the tach. In fourth gear the two needles will be just about parallel on the gauge. In third the tach needle will lead the speedo needle. As for finding first, having a gear indicator in the dash never stopped me from occasionally trying to start out from a stop in second gear anyway. Gotta get into the habit of kicking her all the way down when stopping and then raising the lever into neutral if you want it.
 

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I believe they calculate the value of speed pulse generator, and compares it with rpm signal. If it's like some readouts I've encountered on logging equipment, it has to be "set up", initially. I believe it'll show neutral, when stopped, even tho it's in gear. I doubt that's all that accurate. I wouldn't bother, myself. I'm with Exavid on this one. Knowing what gear one is in, will become second nature, after some time on bike.
 

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I don't have a problem nowing what gear I'm in. it is second nature to me .
I'm just wondering how these things work and if they can be homebuilt.
I do want to add a oil presure gauge,volt, and posible amp meter, to my GW.,

so you guys think this is tied into the GW harness somewhere and no a add on switch ?
 

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Nope the gearshift sensor(88-93), called gear position switch from '94 on has the following wires coming out of it:

a. Neutral - light green/red

b.Second -Black/yellow

c. Third - white/red

d. Fourth - red/white

e. Fifth(OD) - green - orange

There is no wire for first gear. As the gears are selected each respective color wire is grounded. You could develop an input for first gear with a simple NOR gate, if none of the switch leads has a ground the transmission has to be in first. It would be pretty easy to tap off a signal from all five wires and drive five LEDs for indicators. You don't really need a numeric readout, five LEDs in a row would be cheap and easy to read. You'd need a high impedance to sample with so you didn't effect the other circuits the switch feeds but that's easy to do.
 

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Both the adds above say they won't work on the 88-89,do they say that because 90 and up have a plug already wired in.If that is the case then Paul could you not hardwire the new unit into the gearshift sensor on the 88-89?I guess that was a long way of asking if they say it won't fit because it is not plug and play on the early years.I too had it on my 85 Aspy and although I could live without it I kind of got used to it.Got used to looking down sitting at lights just to avoid those second gear starts.
 

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I don't have the manual for the 88-90 but if the switch is the same there's no reason I can see why you couldn't tap into it. Find the switch and check which wires go to ground with an ohm meter when you shift gears and then splice into them. It wouldn't be plug and play but shouldn't be difficult to adapt. Check the number and color of the wires coming off your switch, if they match up it should work.
 

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Here's one I was thinking, and it needs to be programmed. http://www.gear-indicator.com/ That unit could be adapted to a lot of vehicles, as long as there signals for tach, and speedo.

Apparently the air-rider only works on 90-2000, so only the 88, 89 are exempt. Of course, that could be fixed, probably, with a later switch, and some mods.

And as Exavid pointed out, it must have a "nor" gate set-up, to function properly, due to the missing 1 gear wire. So, in 1st there's no wire grounded, so that would be interpreted as first. All wires are grounded by the switch, except 1st. Too bad Honda didn't provide that circuit.
 

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Thanks Paul
I don't have a schematic for my 89 either,will have to wait untill the bike comes back out or I get the proper manual.
 

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I called http://www.davescyclesupply.com and talked to the guy about his unit.
Very nice man. told me he builds his units.
and that it just ties in to the OEM harness, PNP
with a lifetime warrentee.
but it it doesn't work on the 88-89.

fatwing chris,
you might call Dave's and ask him. Why or what it takes to install one on a 88-89
 
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