gauge: oil temp or pressure?

[chevy joe]

so i will get a pyro and boost, and my truck is a manual trans, so i have to decide which is more important to monitor on a very high mileage truck, the engine oil temp or pressure? my budget is so small its almost non-existent so im looking at glowshift gauges. my brother is a cummins guy and they are REALLY picky about gauges and say ONLY isspro, all others are junk. whats the general opinion around here on gauges?

[Dietoremain]

autometers IMO.