our cars do not have these so where would i install a sending unit, to get a good reading, and to not leak! also oil temp sending also? i could try to do the oil one where the oil pressure switch is, would that give me an accurate temp reading tho?

 

best place for the tranny temp sender is in the pan-
could braze a fitting into the side of a stock steel pan
or drill +tap an aluminum pan for the sender.
Could also put the sender in the "out"cooler line that
goes to the cooler-i have used both locations and they
gave about the same temp
For an engine oil temp sender,in the pan is good and
there is a port in the side of the block above the filter
that is a good location-that is where mine is,corvettes
used this location too.
the oil pressure gauge fitting at the back of the block
is not good for a temp gauge because though there is
pressure there,there is not really any flow past and
you will not get an accurate temp reading...