Hey Dave, I bought the tach years ago and I think it was from RTE . Not sure if they are still in business. I had to modify the inst cluster frame to accept it . They are really sold to take the empty spot where a clock would go. I can send you some pictures of how I did it if you email me at tfinoke@gmail.com Tom
When you said that you had to modify the inst cluster what kind of modification was required. I'd appreciate some pictures. My e-mail is dmbenesch@gmail.com