DC tac hook up..?..

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j par said:
Thank you that's some serious research!!..
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Well I hope it will work with your tach.
I agree, so much more info can be gained with an actual conversation.
I must have something wrong in my head that makes me obsess over stuff like this...

If it works out, you can thank me by posting a pic of you and YR in your cheesburger hats.............!
 
Mopar Sam said:
Well I hope it will work with your tach.
I agree, so much more info can be gained with an actual conversation.
I must have something wrong in my head that makes me obsess over stuff like this...

If it works out, you can thank me by posting a pic of you and YR in your cheesburger hats.............!
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This is the reply I got play quickly and names have been changed to protect the innocent LOL...
Hi Jpar -

I haven't run into one of these in the past.

If it can be driven with a dc voltage proportional to RPM, our TachMatch TM-03 would likely do the job. It can be triggered by the MSD.

Perhaps you could see if it responds to dc. If you have access to an adjustable dc power supply (maybe 0-10 v or so), I would connect it to the tach through a resistor (maybe 1kohm or so), then very slowly increase the voltage from 0, to see if the tach responds. The resistor would limit current to help prevent any damage to the tach. If you see no movement in one polarity, try the other. Most lab supplies also read out current, so I would keep an eye on that, and if you see current start to go up and the needle not moving, I would stop to prevent possible damage to the tach.

This would not be much different than hooking up a TachMatch with the vintage-tach adjustment set to zero, then slowing increasing the adjustment. If you would like to try this, you could buy a TachMatch ( we sell direct from our website www.TechnoVersions.com ), try it, then return it if it doesn't work for a refund.

However, I'm guessing that it wants to see an AC voltage with frequency proportional to RPM. That would take a special circuit design which wouldn't be cost-effective in such a low volume.

A few years ago I designed an adapter for the old Smiths tachs used in Jaguars. These have an AC tachometer generator built into the engine. They drive it with AC, but the tach also works with a dc input. Hopefully you might be as lucky. On the other hand, it took 30 or 40 volts, more than a TachMatch could provide.

Regards,

Brian
 
j par said:
I've seen these on eBay or on the Internet.. at one point there was one for sale with the box and everything and as I understand it Ford babe a version as well..
View attachment 1715454807
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My friend is selling me a NOS one of those in the box....it’s going in my display case so it can collect dust with my other Dc stuff lol....too bad somebody put tape on the box...I’ll try to fix that up

EC78DF69-6D1B-49E8-B4DF-0B69C736F87F.jpeg
 
66340SEDAN said:
My friend is selling me a NOS one of those in the box....it’s going in my display case so it can collect dust with my other Dc stuff lol....too bad somebody put tape on the box...I’ll try to fix that up

View attachment 1715454970
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When I Googled it an old ad from 2008 here on the Forum show a guy selling one for $50... I thought I seen one on eBay for a couple hundred a few years ago.. but we're talking everything brand new in the box ready to operate.. never used.. if I had everything to go with it I would put it in my car and use it. I've talked about it here on the forum before and there are members that have them connected in their car...
 
I got my distributor here on FABO, I think it was around 100 bucks, that was about seven years ago...maybe more? I want to run an actual tach drive tachometer and cable with the distributor in my car because it looks so cool and old-school, too bad Mopar didn’t make any Mechanical Tach Drive distributors
 
66340SEDAN said:
I got my distributor here on FABO, I think it was around 100 bucks, that was about seven years ago .....I want to run an actual tach drive tachometer and cable with the distributor in my car because it looks so cool and old-school, too bad Mopar didn’t make any Tach Drive distributors
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I think the real problem is the little generator that plugs into the distributor to run the tachometer..
 
J-par
i think your still at the question as to what is it. If you can find one that works.........then who cares!
But if you have to find a aftermarket one..... now you need to know what that generator does.
creates a AC or DC voltage? is it a variable voltage..............or is it a pulse generator like you see attached to a speedo cable at the transmission. Which my guess is, that is what it does......but now there are many different pulse generators(how many pulse per rev does your tach calibrated to.
When i went looking i found 8 and 16 pulse per rev units if that's what it need then there about 20 buck, and that's no big deal.

If you need a different pulse then, that...............all i found was testers/simulator that were hundreds of dollars..........
 
Cudafever said:
J-par
i think your still at the question as to what is it. If you can find one that works.........then who cares!
But if you have to find a aftermarket one..... now you need to know what that generator does.
creates a AC or DC voltage? is it a variable voltage..............or is it a pulse generator like you see attached to a speedo cable at the transmission. Which my guess is, that is what it does......but now there are many different pulse generators(how many pulse per rev does your tach calibrated to.
When i went looking i found 8 and 16 pulse per rev units if that's what it need then there about 20 buck, and that's no big deal.

If you need a different pulse then, that...............all i found was testers/simulator that were hundreds of dollars..........
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I would rather spend a couple two $300 and get it to work with my MSD then spend that much on an old distributor and still try to find the accommodating parts to make it work...
 
If you can prove.....or some one can confirm that it is in fact a Pulse Generator. then i would go the the wrecking yard and pull one of a 80s plus, GM produce with a auto transmission. they are a two wire hook up just like your tach(two black wire)
hook it up to your tach and give the generator a spin. if nothing happens spin it the other way.
 
Remember the MSD has a seperate post for the tach because if you pulled it of the coil the tach would go crazy!

Just like a timing light with an adj setting goes wacko with a MSD aka Multiple Spark Duration
 
Cudafever said:
Remember the MSD has a seperate post for the tach because if you pulled it of the coil the tach would go crazy!

Just like a timing light with an adj setting goes wacko with a MSD aka Multiple Spark Duration
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My adjustable timing light does not go crazy with my MSD..
 
j par said:
I think the real problem is the little generator that plugs into the distributor to run the tachometer..
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There is a pulse generator on eBay for sale... VDO 340-001 Tachometer Speedometer Generator Sender 7/8-18 copy and paste if you wish

pulse tach.jpg


pulse gen link.jpg
 
Dicer said:
There is a pulse generator on eBay for sale... VDO 340-001 Tachometer Speedometer Generator Sender 7/8-18 copy and paste if you wish

View attachment 1715455059

View attachment 1715455060
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thank you, I have no idea what I need exactly and I believe there's quite a few different variations.. that and I have to get the correct distributor as well.. and again I would rather it's some kind of conversion and still be able to run my MSD if that's possible..
 
66340SEDAN said:
My friend is selling me a NOS one of those in the box....it’s going in my display case so it can collect dust with my other Dc stuff lol....too bad somebody put tape on the box...I’ll try to fix that up

View attachment 1715454970
Click to expand...
Performance News March '85 add......
upload_2020-1-19_9-48-18.png


j par said:
I've seen these on eBay or on the Internet.. at one point there was one for sale with the box and everything and as I understand it Ford babe a version as well..
Click to expand...
Same thing only it's different...........
Vintage 80's ET Performance Timer Mopar Dodge Dart Omni Ford Mustang 5.0 Gtech | eBay
 
@halifaxhops has helped me tremendously.. the problem is I just don't know if I'm ready to pull the trigger on near $500 worth of parts to make this tachometer work.. I can see where eventually I would want to get the parts together for it put I just don't know if I'm really wanting to switch up my ignition system to accommodate it... It's quite an investment for a $50 tach I got off of Craigslist several years ago....
 
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