Help understanding the different between NPT and BSP for oil pressure gauge

[Volcom]

I've got an autometer oil pressure and water temp gauges that I need to hook up before I start up my new motor.  The oil pressure gauge has a 1/8" NPT Sender and includes 1/4'' NPT adapter/fittings.  What size is the stock oil pressure hole in the block?

Same thing with the water temp gauge.  It has a 1/8" NPT Sender and includes 3/8" and 1/2" NPT adapter/fittings.  Where is the best place to tap into for water temp?

Any help would be great!

[Volcom]

Oh yea, are the Toyota's BSP or just metric?

[79coyotefrg]

i think i actually  too the brass oil fitting i had  and used a metric die  and made it metric,  NPT  is National Pipe Thread

best place for water temp is at the front of the intake near the thermostat

[Volcom]

So are the Toyota's metric or BSP?  I found adapters on autometer's website to convert from NPT to either metric or BSP. 

Do places like Napa sell these type of adapters?