I have a Wrench Force pump that is about 15 years old, maybe older (I think it was sold by Trek). I always pump up the tires on my 3 Speed to what I thought was 70PSI. The other day I came across an cheapo electronic tire pressure gauge that was a freebie but never used. After pumping up my tires to 70PSI I tried the gauge and it read 59PSI. I tossed it on the bench thinking it was junk but paused and pulled out a high pressure truck gauge and it read 60PSI. I connected the pump back to the tire and it read 60PSI.... Thinking I was going nuts, I pumped it back to 70, checked with the two other gauges and the read about 62PSI. Tried the same on the front tire same result.. Obviously 60PSI is what I must be using and happy with and the pump is wrong. Why the pump reads correctly when its reconnected is a mystery to me unless there is that much air pressure built up in the hose. Any thoughts on a fix or am I going to have to buy a new one? I could just keep using 70 as 60, but I have no idea what the spread is at other pressures.