Back then I was writing articles for Kit Car Mag. I wrote one on the Tri-Alert but it did not get published. I had a small garage fire on my bench that ruined part of the housing for the Tri-Alert I had. Autometer sent me a new one. I do have the old one and it appears to be fine except for the housing. If anyone wants it just pay shipping. You could probably get or build a housing for it.
The damage is isolated to the cover and one end of the housing but the guts and wiring look fine.
Large pic at
http://www.priveye.com/images/TriAlert.jpg
Roscoe