Here is an old AC speedo, which is in incredible shape & works like butter. You can't believe how heavy it is. It fits into the standard 3-3/8" hole. It must have come from some sort of testing setup, because it has the 1:1 ratio RPM'S on the outer band. Mounting bracket included. I might have a cable for it, but Rusty Buster of the HAMB can make you a custom one to mate to your particular tranny. The price is plus shipping....$15 to the lower 48. PayPal (F&F) or a Postal Money Order would work. The first P.M. committing to buy gets it.