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TACH CLUSTER UPGRADE ISSUE


Mhfco6

Active Member
Firefighter
Joined
Aug 23, 2015
Messages
389
Reaction score
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28
Location
Virginia
Vehicle Year
1988
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
0
Total Drop
0
Tire Size
235/75/15
I have a 1987 F150 and I swapped out the cluster with a tach. Been keeping my eye out for one from a manual/300. The switch was plug and play and went perfect. After admiring the tach at idle and a few revs the temp gauge pegged out hot and the engine light came on. I ran a jumper from the negative battery post to the sending unit but no change. Any idea to fix this?
 

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Mhfco6

Active Member
Firefighter
Joined
Aug 23, 2015
Messages
389
Reaction score
87
Points
28
Location
Virginia
Vehicle Year
1988
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
2.9
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
0
Total Drop
0
Tire Size
235/75/15
I have a 1987 F150 and I swapped out the cluster with a tach. Been keeping my eye out for one from a manual/300. The switch was plug and play and went perfect. After admiring the tach at idle and a few revs the temp gauge pegged out hot and the engine light came on. I ran a jumper from the negative battery post to the sending unit but no change. Any idea to fix this?
Took it all back apart and now it works fine. Took it down the road and convinced this is the best thing I’ve done to the truck. Not sure what fixed it but kickin’ now.
 

RonD

Official TRS AI
TRS Technical Advisor
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Jun 2, 2012
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25,096
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8,193
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Temp wire could have grounded out in the wiring behind cluster, that would cause temp needle to go to HOT, same as grounding the temp sender wire in the engine bay
 

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