I used a 15 amp switch with that sort of system but when I switched to the new style GPs requiring a 80 amp fuse I ran the wires through a solenoid. You can get a 15 amp push button switch at any auto supply and use a solenoid just to be sure. Or you can look under the driver side "knee" panel and check out the GP relay. I was too cheap too buy a new relay, that was several years ago and i like my push button. I dont need no relay too tell me how long too glow those plugs 
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug
"Lifes too short to drive a boring car"
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