I am sure nobody else has this problem but me but I did some work
 on it so I will share it.
 Somebody gave me a CHT/EGT scanner for my O-470 that reads out
 in centigrade rather than Fahrenheit.

Paul, a mental trick going from Centigrade to Fahrenheit is

multiply C by 2
subtract 10%
add 32

The results are exact.  Harder to go the other way in your head.

Bill Schertz
KIS Cruiser #4045

Thanks Bill. Kind of tricky when you have used F to lean for the last 30 years :-)

I got another problem. For some strange reason I think my tach is off.
Any of you EE types have any suggestions for making a cheap tach
that will work with mags? Preferably digital.

My local aircraft instrument shop does not want to work on the Cessna
mechanical tach because it is sealed. Apparently Cessna buys a cheap diesel truck
tach from Stewart Warner and has it labeled "aircraft".

Paul Lamar
 
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