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easy way to check the head temp sensor is to ground the wire for it out and try to start it ( simply bypasses it )
second hot wire the fuel pump to get it to run or just put a relay on the reg board and ground the front left pin out of the four at the rear left of the board ( bypasses the double relay fuel pump relay )
third open the double relay and check the relay on the right ( looking at the tabs that move ) and make sure your not losing the relay, mine was loosing the ground due to a broken solder joint, could not see it check it with ohm meter
or email me for more info
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scott thacher
75 914 with 2.5 l 98 suby engine on the road
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