You are going to have to do a bit of wire rerouting for push button relay operation.

OD relay from a manual trans OD. Blue box. I do not have one sitting around so I am unable to give you a part number.

The numbers on bottom of relay need to connect as follows. Colors are from the 200's relay socket.

15 blue receives power from fuse panel and also feeds to shifter switch.
31 black is to a ground point. Grounds internal circuitry of relay.
85 red goes to 4th gear switch. Other terminal on 4th gear switch needs to go to a ground and not the solenoid.
86 brown returns from shifter switch.
87 yellow goes to solenoid and dash light.

If a slide switch, power flow should be:
fuse, switch, dash light and 4th gear switch, solenoid.

Duane