the original one would work for 2-5 minutes, then drop off to 0 and wouldn't work, I bought a replacement one and it appeared to work the wrong way, and take the gauge below zero when the motor was started rather than raise it, I put a second hand one in we bought from a swap meet, and this did nothing. I haven't investigated it too much more but decided to buy this NOS one, if it turns out to be a HQ one and doesn't work we will certainly sell it for what we paid for it...

RB