I've got an old IH tach that stopped working. I snagged it out of an old R-series wrecker in a junkyard when I was a kid, but it looks like could have been used for the L-series as well. The internal tach unit has rusted to the point that there is a break in between the needle shaft and the input drive. Anyone have another one or, even better, a spare Stewart Warner internal tach unit that works? I believe any 4000rpm tach unit from the K-series to the R-series would work. This is what the gauge face looks like.. Thanks!