Re: Tach on a diesel

Posted by Wardner on January 31, 2006 at 03:35:08 from (4.154.241.47):

In Reply to: Tach on a diesel posted by Brad in WI on January 31, 2006 at 01:42:57:

You could also use a Stewart-Warner hand-held mechanical tach. They work in either direction. Place it on the end of the PTO shaft and read the number. You will have to multiply that by the ratio of your constant mesh gears in the tranny. The ratio can be calculated from the number of teeth on both gears. The teeth count will be listed in your parts book.

Harmonic tachs are also available. They are placed against the block and are accurate. I have seen them used several times. I believe they are cheap.

For a permanent installation, I would probably get the tach and tach drive from a SMD, 400D, or 450D just to keep things kinda original. The tach drive is part of the distributer and cannot be separated.

If you don't want to do any of this, have someone follow you down the road while you are in fifth gear. The chase car should be doing 16 mph when your throttle is fully open.

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