As Rich says, you want a 10V regulator. I use the Spiyda solid state one
SpiydaYour engine pressure gauge should be 'mechanical' rather than electrical. There is usually a narrow plastic pipe coming from the engine block, into the kingpin oiler and then pnto the gauge.
WIth the correct voltage regulator your engine temperature should be around the N. On mine there are two tiny little white dots on the edge of the gauge and the needle sits there once warm.