From looking at the print it looks like you can take term. TSL1 (con3-5 on 188 E board)and TSL2 (con3-6 on 188E board) to G24 to simulate ETSL. There is no mech sw. on a TAC 20 its all done through the selector. The input is active low. Also on the TAC 20 the term. slowdowns are through mags on the back of the tape at the term. landings so you can also throw a couple of mags on the back of the tape in the same lane in the middle of the hoistway run to simulate also.
