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Old 07-11-2018, 06:42 PM   #1 (permalink)
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Default Instrument cluster faulty????

Have an '86 Tin top that has been in the shop for the last 8 months attempting to get all the gauges working.
Previously, it had been sitting and used very little. However, it runs well and seems to be in good condition.
The main issues seem to be inoperative oil pressure gauge and fuel gauge.
The mechanic has removed the dash and checked all connections as well as all the connections under the hood and every place he can find any connection, however, he says there is power coming from the fuel pump and oil pressure switch but is is just no connection to the indicators on the panel.
I asked him to check it again in the event that he missed a connection and he did but found no issue other than no power getting to the gauges.
We are out of options and have not been able to locate a replacement cluster.
Has anyone had this issue and if so, how did your resolve it?
Can the cluster be rebuilt or checked by a shop that makes such repairs? We do not know of any or can find any?
I guess one could guess about the amount of gas remaining in the tank, but I hesitate to guess on the oil pressure.
Any assistance, guidance or direction would be greatly appreciated.
Thanks again.
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Old 07-11-2018, 08:46 PM   #2 (permalink)
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fordem will become famous soon enough

Unless I'm very much mistaken, an 86 Samurai will not have an oil pressure gauge as a standard fitting - there will be a speedometer, fuel gauge, water temp gauge, and possibly a tachometer - as on most cars, low oil pressure is indicated by a warning light as are under/over charge conditions.

I want to suggest that you find an auto electrician, your mechanic is obviously out of his depth on this - power does not come from the fuel pump or the oil pressure switch, in fact, on an 86, the fuel pump is mechanical and driven off of the camshaft - no electrical connections at all.

The gauges - fuel & temp - and all of the warning lights get their power from the ignition switch, and they ground via the sensors or senders - the low oil pressure warning light is a very simple circuit - one wire takes power from the ignition switch to the bulb, and a second one connects the bulb to the switch on the engine block - it shouldn't take an experienced auto electrician more than a few minutes to troubleshoot that, and probably less than an hour to a separate warning light if you choose to go that route.

Diagrams & manuals are available from Ack's FAQ.
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