A tachometer in a P-30

JimFromJersey wrote:
The vac gauge does let you know when the engine is performing 'efficiently', but it's somewhat disheartening to see the tach floating around 3000 rpm at 55-60 mph. I guess there's just not much we TH-400 owners can do...

Sure there is. 4L85E. It's not that bad of a swap. The underside of a motorhome has a lot of space, so its ends up being pretty easy to more a trans mount. Shortening the driveshaft is pretty cheap. Trans controller is 6 bills and easy to set up as well. It is actually kind of nice to be able to custom tune your trans for your specific driving style. I have mine programed to up shift late, but then not downshift until I really get into the throttle. It keeps the TC locked up most of the time, unless I really need it to downshift.