CH-ADAPT... the $65 black-box that makes your tachometer work right!

s pulse rate conversion feature makes it possible to match your vintage tach to 4, 6 or 8-cylinder engines.

Its pulse restoration feature makes it possible to trigger your tach properly from modified ignition systems. 

 Its pulse filtering feature cleans up trigger waveforms, eliminating erratic behavior.

Here is the Tachometer Adapter that really works!  More than 800 TACH-ADAPT units are in service with the number growing every day. This Tachometer Adapter is easy to install with straightforward switch settings and a diagnostic LED feature that shows it is locked to the trigger signal from your ignition and sending a solid output to your tachometer.

TACH-ADAPT is available direct through this site and is also offered by major suppliers  Pelican Parts and Sierra Madre Collection!

What Users say about this product...

"I was really stuck with the MSD box on a 70 911T. Tried the MSD tach solution and no-go. Talked to MSD , that didn't work. I contacted Bob after reading the positive reviews and decided to try his product. After spending 5 hours on the MSD unit, it took us only 30 minutes with Bob's Tach Adaptor to get the tach to work again. His communication with myself and my mechanic really made it happen. He responds super fast and explains what you are trying to do. I wish I went with this product from the start. If you have tach issues Bob is your man! " --Dan E.
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Bosch CDI (BHKZ) Diagnosis, Repair and Restoration

Hard or intermittent failures in these units typically involve a short or breakdown of the main power components (hi
gh voltage discharge capacitor, power transistor, thyristor and open board traces). 

At the time of manufacture the main discharge capacitor used a technology that is increasingly prone to failure with age and use. Simply stated, this part will fail and often causes secondary failures when it does.  Also, components are often damaged by reverse or over-voltage events caused by faulty vehicle charging systems, over-charging  or jump-starting a dead battery.

Servicing the power components in these hand-wired units requires extensive dis-assembly. Defective parts are replaced with modern high-quality devices with performance ratings superior to the original 40-year old parts and as a matter of policy, service always includes replacement of the discharge capacitor with a device that is more robust and does not deteriorate with age and use.

Contrary to popular opinion, it is not necessary to replace all components in these units.  With noted exceptions, the majority of components used by Bosch are not stressed, are very high quality and generally do not require replacement. 

If you suspect your unit is faulty, e-mail Bob@AshlockTech.com and arrange to send it in for diagnosis and repair.  It's the smart choice compared to substituting a 30 - 40 year old used unit with questionable life expectancy.   More than 300 restored units are already back in reliable service!  

Here's what we do:

CDI Repair and Restoration Service:  $199 plus shipping *

  • Repair, Restore and Test:  YOUR defective unit is repaired, stress-tested and warranted for 1-year.  The repair price includes cosmetic restoration (cleaning, bead-blasting and re-labelling) to provide a ‘like new’ appearance as shown above.  FAST turnaround too!

Completed CDI Units:  $399 plus shipping *

  • No core to send in for rebuild?  In a hurry?  An inventory of restored units are kept on-hand for immediate shipment. Why spend over $400 for a salvaged, un-restored, questionable box when you can have one that has been rebuilt & restored, works perfectly and carries a warranty?  Inquire for availability!
*Shipping is by US Postal Service Priority Mail, or by UPS.  Units are insured for $400 during shipment.

1218 N. Lemon St.
Fullerton, CA 92831


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