Tach repair

[Mepstein]

I have a buddy who does all the work on my Porsche gauges. Rebuilding, modifying and problem solving. He’s an HVAC guy who understands electronics and does the gauges on the side. I sent him my Morini tach that wasn’t working. He has a couple ways of fixing it, from adding a “chip” that takes the signal and processes it with modern electronics and/or replacing the “guts” with a modern tach. He’s done one for me recently and said it works great. He’s just waiting for the proper bezel to reassemble the gauge. Here’s some comments and pictures from him.

I’ve been using Bobs module recently. Unless the movement is screwed, then I use the sun pro tach guts, which is another good solution as it eliminates the tach bounce. Bobs module works good, but does nothing for tach bounce.”

It’s a pretty inexpensive solution to repairing our tachs and have them working for another 50 years. Hope this helps someone.

[EVguru]

Needle 'bounce' is caused by the damping oil having seeped out over time; There's a well behind the bottom pivot. You can buy small quantaties of damping oil from record deck repair specialists, it's used to damp the tone arm.