A pressure sensor in the control pressure feed is definitely a must have - even just for logging purposes.
I'm testing a small and inexpensive digital 0-100 (7 bar) unit that seems to be available on eBay for around USD24.
A T-fitting in the line or a 1/8npt drilled and tapped into the side of one of the aftermarket injector holders for those with the bypass injector setup. The little block and banjo fitting above would be nice too.
