Tachometer rebuild Options

[totle]

Hi,

Anyone that have a DIY description of how to rebuild a 7k Tach to a 10k Tach ?
and from 4 cyl to 6.

I would think that there is someone who has done this.
Any potmeter adjustments, og parts that needs to be replaced ?

I know that NHS does this, but would be nice to do it and just buy a new faceplate

[timothy_nd28]

The Ashlock tach-adapt is the wrong product for what is trying to be done here. The tach-adapt will not re-scale our existing tach to a 10k faceplate. With that said, he does have a product for sale called a "tach-drive module" which is made for re-scaling and could be a good option. Since Ashlock's tach drive replaces all the electrical guts in our existing tach, it still needs to reuse the original movement, so there will still be some needle bounce.

My idea is the same principle as Ashlock's tach-drive module, but you get a new air core motor that replaces the old spring mass movement. New electronics and a new modern style servo motor equals no needle bounce.
Here's my write up: http://www.914world.com/bbs2/index.php?showtopic=216719

So to reinstate the question that was originally asked, can you take a stock 914 tachometer and convert it into a 10k tachometer?

Yes, and there are some company's out there that will gladly do this for you. NHS will take your existing tachometer and convert it for you for upwards of 600 dollars. I think the better question would be "can you convert a stock 914 tachometer to a 10K tachometer for under 100 dollars"?

Either Ashlock's module or my conversion method will have you covered in the electronics department. The new artwork for the face dial is the real issue IMO. It may be worth buying this premade 10k face dial and doing this conversion. But this dial is overseas and might break the 100 dollar budget limit.

[Retroracer]

"can you convert a stock 914 tachometer to a 10K tachometer for under 100 dollars"? is a great question!

Found this thread intriguing; I'm up for trying this with a -4 tach, Tim's updated tach innards (excellent R and D around this Tim, nice work!) and a replacement / hacked 10K face. The German one is a bit pricey but not too bad, noting that the "VDO" label is not present, presumably for legal reasons. I'll investigate the Aussie alternative (thanks Porschetub).

Already stripped the -4 tach, will post progress if anyone has interest. This will be used with a -6 engine running MSD Strassefeuer ignition for the tach output.

- Tony