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Old 10-18-2021, 10:59 AM   #1
spock345
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Default Electronic speedometer pickup on an Amazon?

After watching AndrewNance put digital gauges in his amazon I am tempted to do the same with mine and build a custom drop in gauge cluster so I don't have a bunch of stuff hanging below the dash.

The big challenge seems to be the speedometer signal. I like the idea of a magnetic pickup somewhere. I know there are ones that thread onto where the speedometer cable would normally go but I am coming up short on finding a M18x1.5 pickup that would match the threading on my M41. This would probably be the cleanest way to do it.

Other than that I've also looked at a magnetic pickup on the driveshaft or wheel. Which may work but I worry about how vibrations and suspension movement would impact it. Apparently a hall effect sensor would only need a magnetic object to create a pulse signal. So a drive shaft bolt at the output of the transmission may just do the trick.

My last idea is to find the rear diff cover from an LH 2.4 car (Dana 30 covers should swap right?) or drill a hole in mine and see if I can't get a signal from pointing a pickup at the diff.

Has anyone rigged up a electronic speedometer pickup on an Amazon? If so how?
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Old 10-18-2021, 10:15 PM   #2
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Well I found a VDO sender that should do the trick. Part number 340-214-013-001C, M18x1.5 thread, three pin connector, seems to be what some of the VW Bug guys use. Should attach to the M41 J type output ok.
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Old 10-19-2021, 07:15 AM   #3
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Cool. I need to measure the Datsun truck trans.
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Old 10-19-2021, 08:59 AM   #4
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See the last few posts here for an inline sensor, and a right angle converter:
http://forums.turbobricks.com/showth...09#post6217209
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Old 10-19-2021, 11:25 AM   #5
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Originally Posted by bobxyz View Post
See the last few posts here for an inline sensor, and a right angle converter:
http://forums.turbobricks.com/showth...09#post6217209
It seems like this is going to be my best bet. I can't find the VDO sensor anywhere but some VW focused stores, and those mark it up 100% over what the catalog price was. Apparently it has also been phased out.

Just having something attach to either the stock speedometer cable or speedometer gear in the gearbox seems like the cleanest solution to me.
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Old 10-19-2021, 01:32 PM   #6
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You could try a VW type sender, 191 919 149E. They appear to have a M18 x 1.5 fitting to attach to your M41.

https://www.ebay.com/itm/150783612042

Lots cheaper than the BR4 sensor.
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Old 10-19-2021, 02:56 PM   #7
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Quote:
Originally Posted by bgpzfm142 View Post
You could try a VW type sender, 191 919 149E. They appear to have a M18 x 1.5 fitting to attach to your M41.

https://www.ebay.com/itm/150783612042

Lots cheaper than the BR4 sensor.
I actually just placed an order for the VW sensor. No idea how many pulses per revolution but I'll just have to hook it up to my oscilloscope and check.
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Old 10-19-2021, 05:12 PM   #8
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If you're doing custom gauges already, why not just get a GPS speedometer?
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Old 10-19-2021, 05:16 PM   #9
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Volvo speedo wire makes about 1100 rev/mile. Sensors seems to give 4 pulses per revolution.
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Old 10-19-2021, 07:03 PM   #10
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Quote:
Originally Posted by LloydDobler View Post
If you're doing custom gauges already, why not just get a GPS speedometer?
I know GPS is accurate nowadays but I had some experiences with it when I was younger that made me not entirely trust it. I'd prefer having the system determining gauge readings be entirely contained within the car.
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Old 10-19-2021, 07:04 PM   #11
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Quote:
Originally Posted by OttoB View Post
Volvo speedo wire makes about 1100 rev/mile. Sensors seems to give 4 pulses per revolution.
So then 4400 pulses per mile. Most available 3 3/8" speedometers seem to support that.
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Old 10-23-2021, 09:33 PM   #12
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That VW sender showed up today in the mail. Fits both my M41 and the M40 I have taken apart perfectly. Also lower profile than the right angle adapter. Now to wait for the speedometer.
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