People ask me if my car is an original Mr Norm's GSS Demon. The tach is an excellent repo of the nos one. I'm a fussy guy and would have sent it back. OH BTW, it comes with NO instructions. Simple: red positive, black ground, green - side of coil. No brainer.
You can't tell the difference when mounted. Unmounted the bottom does not have any mounting lugs. You will have to be creative in that part. I drilled two holes and attached two screws with a little epoxy to the inside of the housing. Once it's dry you can mount the tach. I took a piece of card...
Hahaha!!! I have to laugh. Probably the funniest frustrating thing to take apart. I was on the phone with Dave Paddok from performance car graphics, he tried to walk me through the procedure. I tried every hole in the Damn thing. Took me two day to pop it apart. I still don't remember how to do...
There is also a GREAT book to decode BROADCAST SHEETS.
Book Title: 1969-1974 Mopar Broadcast Sheet decoder manual
Author; Jake Hare
Publisher: PAH Publishing
Price: $21.97 USA well worth the price just for the knowledge alone!
I have recently purchased a reproduction style DIXCO hood tach for my 72 Dodge Demon. After a long search for an original one on e-bay and cruising local and major swap meets since 1997, I finally gave up. I was not going to pay the ridiculous prices of a NOS one. One day I went on e-bay...