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Discussion Starter · #1 ·
i'm having to figure out what i want of gauge in my car. i need to have GPS speedometer in the middle and therefore have two available gauge with two options each. what would you choose. State of charge, water temperature, tachometer, amp meter, org
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just for reference, GPS speedos can suck pretty badly at times. If you start moving and they don't have a fix, they sometimes need to stop for a few minutes to get a fix, particularly if cloudy. They also don't work very well on cloudy days, in tunnels... They are also not legal in some countries. I did 13000 miles with one as it was easier than fixing the OEM speedo at the time and I'd often have to wait for it to fix before taking off.

To answer your question, I'd have the most critical temperature, inverter or motor and battery charge state wired to the OEM temp and fuel gauges. That is what I am doing, once I figure out how to get can signals output as low side drive analog 12V. For the speedo there are various options for electric motor drives which go on the gearbox end of the speedo cable and take a can signal.
 

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Discussion Starter · #3 ·
just for reference, GPS speedos can suck pretty badly at times. If you start moving and they don't have a fix, they sometimes need to stop for a few minutes to get a fix, particularly if cloudy. They also don't work very well on cloudy days, in tunnels... They are also not legal in some countries. I did 13000 miles with one as it was easier than fixing the OEM speedo at the time and I'd often have to wait for it to fix before taking off.
Nice to know. i still want to go with that solution and then think that a tachometer then I can always use this in case of failure of gps
 

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1986 Honda CRX (EM57 2013 Leaf Motor)
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I was looking into this in my CRX EV build. I'd say put any speedometer cluster you want and get the speed input data needed to utilize your cluster.

In the case of my 1986 CRX, I actually have a 2001 Honda Insight digital cluster which requires an electrical vehicle speed sensor input. The Leaf motor I'm swapping in doesn't provide that signal as they use wheel speed sensors.

So to mimic the VSS, also taking on the idea of how wheel speed sensors work, I pick up a hall sensor from racepak. It looks like this:

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I then picked up a collar like this to attach to my axle:
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I would need to mount the sensor in a stable position where it would detect the magnet passing. Some people mount it on the rear wheels. Etc.

From there, we need to convert that input out to the speedometer. If your vehicle uses mechanical speed input, speedhut sells an adapter to convert digital to mechanical.

For me I need to correctly scale the pulses to match the input expected by my speedometer which I'm planning to try to use this:
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In the end, the goal for me is to use my own speed cluster. If you don't like your current one, you can change it. As other said, speed by GPS has flaws where you might lose signal and that has reliability issues. Start with what cluster design you like, then work backwards to make it work is my suggestion.
 

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Discussion Starter · #6 ·
Thanks for you replay windraver.
I will se if I can get the speedometer I like in a non gps version.
Then I think I will go for the this 4 gauge.

State of charge
Temp on engine/inverter.
Ampere meters
Tachometer
 

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1986 Honda CRX (EM57 2013 Leaf Motor)
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Thanks for you replay windraver.
I will se if I can get the speedometer I like in a non gps version.
Then I think I will go for the this 4 gauge.

State of charge
Temp on engine/inverter.
Ampere meters
Tachometer
Yea I just did a POC with my Honda CRX using a Honda Insight cluster because I like those fancy digital clusters and I got it working. So find the style you like then figure out how to make it work for whatever you're installing it into.
 

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You don't need a tach on a fixed ratio gearbox. A speedo is basic equipment for roadworthiness in many places...that gets you an odoneter in most cases.

Otherwise, an hours meter is useful in place of the odo for maintenance & valuation

Buyer: "how money miles/hours on it since the conversion?"
You: "I have no idea...."
 

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Discussion Starter · #9 ·
You don't need a tach on a fixed ratio gearbox. A speedo is basic equipment for roadworthiness in many places...that gets you an odoneter in most cases.

Otherwise, an hours meter is useful in place of the odo for maintenance & valuation

Buyer: "how money miles/hours on it since the conversion?"
You: "I have no idea...."
I go for an ordinary speedometer with obd counter.
I have a gearbox on so I could use tachometers in som cases but it is not very necessary.
 

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Just an update for the gauges from speedhut.
the order is set am I got the first picture from them.
View attachment 127808
What's "KM/T" supposed to be? Speed, in km/h? I can't tell if it's a typo (a good reason for sending artwork proofs) or something deliberate that just isn't apparent to me.

It's also strange to have yellow and red zones on a speedometer. That could indicate motor speed, but it would only make sense when using one specific transmission gear. Is marking zones on a speedometer a local thing there?
 
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