I may be wrong but in all my experiences with timing tensionors both hydraulic and spring loaded they don't require oil pressure besides the chain could slip during startup and ruin your valves.

ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap