Fraser Kinnerley (33) and Quintin Purvis (34) put on a solid opening partnership, and then Gill (44 not out from 33 balls) carried on the momentum, hitting four boundaries and a six.
While there was some nervous moments when Nick Harding and Dominic Lock fell cheaply, Ross Kinnerley (17) and Kane Watkin (15 not out) stayed with Gill to see them home, as Tech got some payback on Strang by swiping 59 from his six overs.
Bowler J Smith took 2-24 from three overs.
The win over the lowest ranked Horowhenua-Kapiti team keeps Tech in fourth spot, but they will have a tough lead-in to the semifinals as they face second-placed Property Brokers United this weekend, followed by current fifth team Levin Old Boys at Donnelly Park in the last round.
Scoreboard
Kapiti Old Boys 164-8 (B Strang 56, M Harrison 26, A Gill 3-34) lost to Tech 168-5 (A Gill 44no, Q Purvis 34, F Kinnerley 30, J Smith 2-24) by five wickets.