I got a GPS speedhut speedo because I thought "easy".. Then I realised my old mechanical cable also has a reed switch output that I can use with the non GPS version that can also be calibrated.
Surely the non GPS is the best all rounder? Never actually used a GPS set up before.
Any real world users care to sway my decision?
They both have ups and downs. GPS requires no calibration and is very accurate (at least newer ones are, older ones have some lag due to a lower sample rate and accuracy), but doesn't work in tunnels and measures your actual vehicle speed rather than your wheel speed. A powertrain-driven speedo does need calibration, works in tunnels, and measures your wheel speed, which can be a positive or negative depending on any unusual things you might want to do with the signal.
I use a Speedhut GPS speedo in my rebodied old British car with engine transplant and it works flawlessly. The fact that it doesn't funtion until you are out of a tunnel is neither here nor there - I have yet to see a radar trap inside a tunnel!
Does it have an odometer? That "may" be an issue because I've had my unit (part of a flat dash installation) sometimes freeze up. Also, signal dropouts will be an issue where the sky isn't easily visible, like in cities, forests, and high mountains. Than again, how much do you care that the odometer reading is off a few miles.
Not sure this is related but I had issues with a GPS-powered route-tracking app. As the app tracked my position, every once in a while it would lose the signal and suddenly decide that I was 20-something miles away. When the signal came back it would get back in sync, but the problem was the 40-mile "round-trip diversion" getting added to my total distance. Since presumably only GPS speed is used in speedometer and not location, maybe this is a needless concern.
Good info.. I think I'll just stick with the GPS version. Ill be wiring the stock reed switch output from transmission up to Megasquirt for potential boost control and logging.
My speedo will stop registering when you go into a tunnel and picks up again very quickly when you come out the other side. It records mileage, has a trip feature, compass, will clock your 0-60 and 1/4 mile times, and a bunch of other things.
Giant Purple Snorklewacker wins.
I'm switching to using Waze as my speedometer on the CRX, because every cable speedometer in the yards is so worn out it doesn't give a clean signal anymore. The problems with it will be that I'll have to get used to the speedometer pointing to "0" all the time, and avoiding glare on my phone. I think after 303,000 miles the odometer is superfluous, like an hour meter on a DC-3.
wspohn said:My speedo will stop registering when you go into a tunnel and picks up again very quickly when you come out the other side. It records mileage, has a trip feature, compass, will clock your 0-60 and 1/4 mile times, and a bunch of other things.
I didn't realise that the electronic Speedo doesn't have the same features as the GPS.. 0-60 and 1/4 mile times.
Sticking with
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