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Question My dad has a 1991 Chev 1/2 ton truck, 5 litre, 8 cyl, 305 engine and he would like to know (as soon as possible please) What is causing the temperature guage and lights to go haywire? He just put in a new heat sending unit and replaced the thermostate and it is still up and down. We live in Ontario Canada so it is not from hot weather.Thank you, Eva

Reply You could have a bad ground or poor connections. I recommend having a diagnostic check performed. Angelo Silverado Auto Service