I found a tachometer calibrator/exerciser on ebay made by RT Engineering, item 150113251083 . I don't know if this works with analog tachs though.. Speaking of RT Engineering, did you guys see their ad in this (says February 2008) month's issue of MCG? RT Engineering is now selling solid state dash gauge voltage limiters (like Sean made) for $50. I'm thinking of one as a stocking stuffer (expensive one) for myself. Tom This is the answer I got from this man that has helped in the past with Tach questions when I asked him about bench testing..He has a had some tachs on Ebay. Yes I do, I would be glad to test your tach for you, no cost to test, as it only takes a few minutes on the bench, just return shipping, please include a return Shipping Label & package your Tach(s) well. After I test it, if it's working correctly, then I'll return it, if not, then I'll determine what it needs. I am not set up to work on the "Blue line" Sun Super Tachs, or the ST 602, 635 series as these are a Factory sealed unit. Mick McCann 217 Rundall Pl. Binghamton. NY 13905 Mick tachtinkerer@xxxxxxx ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.