No speedo, need to know what how fast I am going based on gear and tach. Help?!

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Tire size?

My 300D w/2.88 diffy, automatic and 14" wheels (Michelin X Radials - P225 R7514) is turning 2850-2900RPM @ 65mph in high gear.

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Never a dull moment at Berry Hill Farm.

225 on bundts? WOW. Didnt know you could even go there.

I am running 215r55 16. What about say 35mph and 45 mph?

Auto and manual trannys have same gear ratios right?

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Older automatics have a bit of slip in the converter, but other than that high gear is straight through on both.

Maybe they're 215s...dunno. They're round and black.

__________________
Never a dull moment at Berry Hill Farm.

Fourth gear speeds and tach readings as follows:

35mph: approx. 1500 rpm
45mph: approx. 1925 rpm
55mph: approx. 2325 rpm
65mph: approx. 2725 rpm
75mph: approx. 3125 rpm

The approximation is due to the slippage. It climbs from 150 rpm (est.) at 35 mph to almost 300 rpm (est.) at 75mph. The harder the engine works, the more the slippage.