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BTR95 (& 5.0L) Conversion Mechanical Speedo Issue 

 

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 Post subject: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 8:10 am 
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I'm doing a SEFI 5.0/BTR95 conversion into an older car with a mechanical speedo. How do I get the electronic speedo signal to the transmission computer so the shift points etc are correct? Is there a speedo drive splitter (or similar) that will allow me to run the electronic sender (for the TCM signal) and a cable drive speedo? Or something that runs off the driveshaft?

Thanks in advance

 

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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 12:20 pm 
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how hard would it be to put an electronic speedo mechanism in the dash? imo thats your best option.
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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 12:38 pm 
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I was in a similar boat with my old P6 LTD. It has a factory 351 and FMX, and i wanted to fit a BTR into it. I heard there was some Y piece that goes into the box and gives 2 outputs, but i never found any other info on it.

So i decided to give up on it and just rebuild the FMX.

 

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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 2:20 pm 
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Have a talk to your local instrument technician that rebuilds car speedo & guages - They usually sell the adaptors to do this job. A mate put a big block Chev & 4L80E into a 66 Chev & the local speedo & guage repairer steered him in the right direction with that conversion...
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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 4:29 pm 
Getting Side Ways
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Yep, I've already tried the local speedo shop and he was of little help. Never even herd of anything like a splitter or piggyback sender.

I've pulled a speedo sender apart to see how easily it could be modified but it's not a simple job.

Then I thought about using a variable oscillator based on a TPS signal but that's not really the solution either.

Someone out there must have found a source of such a piece, or a modification that is relatively easy or a simple circuit that emulates the signal - anyone???

thanks again

 

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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 5:27 pm 
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Castle Auto Electrics on Victoria. They have T piece adaptors that drive the electronic sender from the end and the cable at 90 degrees.

 

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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Sun Apr 12, 2009 7:38 pm 
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Thanks for that, have you used one yourself or know of somebody who has?

I've also thought about welding on a second speedo connection point below the factory one. This should give the opposite rotation that I need for the mechanical speedo.

Cheers

 

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 Post subject: Re: BTR95 (& 5.0L) Conversion Mechanical Speedo Issue
Posted: Thu Apr 16, 2009 6:27 pm 
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Never heard back from Castlemaine....

Anyone else have any sources?

Thanks

 

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