the sensor, lol
Oil pressure,
Tee'd into rear of block, where the dash oil pressure light sender is fitted.
Water Temp,
i found best results on the coolant pipe which goes into the bottom of the Stat housing.
As gives
1) no heat soak (unlike when fitted in the head,
2) the hottest/accurate temps,
3) and reads engine temps even when stat closed. (unlike on a rad hose)