Originally Posted by Rusty

Here's a SpeedHut pressure gauge. 0 to 150 psi. You can tap it in the upper radiator hose, the heater hose by the battery, or into a drain plug in the block.

https://www.speedhut.com/gauge/GR-PR...si-(w--warning)

Upper radiator hose adapter. This is what I have right now. You will only get a reading when the thermostat opens. I'm switching to the heater hose adapter.

https://www.z1motorsports.com/z1-pro...9192b63427add3

Heater hose adapter.

https://www.z1motorsports.com/z1-pro...undledTogether