• The Biplane Forum is a large global active community of biplane builders, owners and pilots. From Pitts to Skybolts, to older barnstormers, all types are welcome. In addition to our active community, our content boasts exhaustive technical information which is often sought after for projects and maintenance. This information has accumulated over the 12+ years the forum has been in existence.

    The Biplane Forum is a private community. Subscriptions are only $49.99/year or $6.99/month to gain access to this great community and unmatched source of information not found anywhere else on the web. We are also a great resource for non biplane users, since many GA aircraft are built the same way (fabric and tube construction).

FS: Vision Microsystem EPI-800 Upgrade


Feb 4, 2012
Reaction score

Biplane Drivers,

Here's the opportunity to upgrade your Vision Microsystems EPI-800 to allow resetting your own tach time for a very nominal charge.

When you have to change out the EPI-800's DPU battery, all your memory parameters are wiped out, everything can be reprogrammed by the owner except the tach time. Until now, reprogramming the tach time required sending your DPU back to the manufacturer -- NO LONGER! After this upgrade you'll be able to reset your tach time whenever you want.

I've recently acquired the tech data and tooling to perform the tach reset upgrade. The upgrade consists of a hardware modification and DPU software function check. The upgrade also includes an operations manual supplement detailing how to change your tach time with the new modifications.

Please email direct for details and shipping instructions ([email protected]). Limited time introductory pricing for this upgrade!Happy Flying,

Latest posts